Update enums.py to generate Kotlin files

Summary:
X-link: https://github.com/facebook/react-native/pull/53133

# Changelog:
[Internal] -

As part of the ongoing effort to migrate the React Native codebase to Kotlin, this PR introduces the initial setup required for Kotlin support in Yoga.

- Added initial basic Kotlin configuration to the project.
- Migrated `YogaConstants` as an initial file to try out the first migration steps.

Pull Request resolved: https://github.com/facebook/yoga/pull/1829

Test Plan:
- Tested the migrated class directly against facebook/react-native, see the PR [here](https://github.com/facebook/react-native/pull/52998).
- Run: `./gradlew :yoga:assembleDebug` & `./gradlew :yoga:compileDebugSources`

I am not able to run the Java tests in this repo (even before the initial Kotlin setup) – not sure if I am missing something there but any pointers are welcome – it seems like there is some missing configuration. Currently trying with `./gradlew :yoga:test`

Reviewed By: cortinico

Differential Revision: D79545992

Pulled By: rshest

fbshipit-source-id: 8257ff53e6b6f2436980be98b6c94e1ac526b207

.gitignore

@@ -73,3 +73,6 @@ local.properties
 
 # Docusarus build
 .docusaurus
+
+# Android Studio
+.idea

build.gradle

@@ -9,6 +9,7 @@ plugins {
     id("com.android.library") version "8.7.1" apply false
     id("com.android.application") version "8.7.1" apply false
     id("io.github.gradle-nexus.publish-plugin") version "1.3.0"
+    id 'org.jetbrains.kotlin.android' version '2.1.20' apply false
 }
 
 allprojects {
@@ -34,6 +35,8 @@ nexusPublishing {
         sonatype {
             username.set(sonatypeUsername)
             password.set(sonatypePassword)
+            nexusUrl.set(uri("https://ossrh-staging-api.central.sonatype.com/service/local/"))
+            snapshotRepositoryUrl.set(uri("https://central.sonatype.com/repository/maven-snapshots/"))
         }
     }
 }

enums.py

@@ -84,6 +84,12 @@ ENUMS = {
     ],
 }
 
+# Temporary filter enums to not upgrade all enums at once
+KOTLIN_ENUM_NAMES = {"Direction"}
+
+ENUMS_KOTLIN = {name: ENUMS[name] for name in KOTLIN_ENUM_NAMES}
+ENUMS_JAVA = {name: values for name, values in ENUMS.items() if name not in KOTLIN_ENUM_NAMES}
+
 DO_NOT_STRIP = ["LogLevel"]
 
 BITSET_ENUMS = ["Errata"]
@@ -120,6 +126,9 @@ def to_java_upper(symbol):
     return _format_name(symbol, "_", "upper")
 
 
+def to_kotlin_upper(symbol):
+    return _format_name(symbol, "_", "upper")
+
 def to_hyphenated_lower(symbol):
     return _format_name(symbol, "-", "lower")
 
@@ -215,7 +224,7 @@ with open(root + "/yoga/YGEnums.cpp", "w") as f:
             f.write("\n")
 
 # write out java files
-for name, values in sorted(ENUMS.items()):
+for name, values in sorted(ENUMS_JAVA.items()):
     with open(root + "/java/com/facebook/yoga/Yoga%s.java" % name, "w") as f:
         f.write(get_license("java"))
         f.write("package com.facebook.yoga;\n\n")
@@ -267,6 +276,48 @@ for name, values in sorted(ENUMS.items()):
         f.write("  }\n")
         f.write("}\n")
 
+# write out Kotlin files
+for name, values in sorted(ENUMS_KOTLIN.items()):
+    with open(root + "/java/com/facebook/yoga/Yoga%s.kt" % name, "w") as f:
+        f.write(get_license("kotlin"))
+        f.write("package com.facebook.yoga\n\n")
+        f.write("public enum class Yoga%s(public val intValue: Int) {\n" % name)
+        if len(values) > 0:
+            for value in values:
+                if isinstance(value, tuple):
+                    f.write("  %s(%d)" % (to_kotlin_upper(value[0]), value[1]))
+                else:
+                    f.write("  %s(%d)" % (to_kotlin_upper(value), values.index(value)))
+                if values.index(value) is len(values) - 1:
+                    f.write(";\n")
+                else:
+                    f.write(",\n")
+        else:
+            f.write("__EMPTY(-1);")
+        f.write("\n")
+        f.write("  public fun intValue(): Int = intValue\n")
+        f.write("\n")
+        f.write("  public companion object {\n")
+        f.write("    @JvmStatic\n")
+        f.write("    public fun fromInt(value: Int): Yoga%s =\n" % name)
+        f.write("        when (value) {\n")
+        for value in values:
+            if isinstance(value, tuple):
+                f.write(
+                    "          %d -> %s\n" % (value[1], to_kotlin_upper(value[0]))
+                )
+            else:
+                f.write(
+                    "          %d -> %s\n"
+                    % (values.index(value), to_kotlin_upper(value))
+                )
+        f.write(
+            '          else -> throw IllegalArgumentException("Unknown enum value: $value")\n'
+        )
+        f.write("        }\n")
+        f.write("  }\n")
+        f.write("}\n")
+
 # write out TypeScript file
 with open(root + "/javascript/src/generated/YGEnums.ts", "w") as f:
     f.write(get_license("js"))

gentest/fixtures/YGAlignItemsTest.html

@@ -240,3 +240,14 @@
   <div style="position:relative; width:50px; height:50px;">
   </div>
 </div>
+
+<div id="align_items_non_stretch_s526008"
+  style="flex-direction: column; width: 400px; height: 400px;">
+  <div style="flex-direction: row;">
+    <div style="flex-direction: column; align-items: flex-start;">
+      <div>
+        <div style="width: 0; height: 10px;"></div>
+      </div>
+    </div>
+  </div>
+</div>

gradle/gradle-enterprise.gradle.kts.sample

@@ -1,17 +0,0 @@
-/*
- * Copyright (c) Meta Platforms, Inc. and affiliates.
- *
- * This source code is licensed under the MIT license found in the
- * LICENSE file in the root directory of this source tree.
- */
-
-// You can use this script to configure the gradleEnterprise{} block in your build.
-// You need to rename this file to ./gradle/gradle-enterprise.gradle.kts in order for
-// this to be processed.
-extensions.getByName("gradleEnterprise").withGroovyBuilder {
-    setProperty("server", "https://your-gradle-enterprise-instance.example.com")
-    getProperty("buildScan").withGroovyBuilder {
-        "publishAlways"()
-        "tag"(if(System.getenv("CI") != null) "CI" else "Local")
-    }
-}

java/build.gradle.kts

@@ -9,6 +9,7 @@ plugins {
   id("com.android.library")
   id("maven-publish")
   id("signing")
+  id("org.jetbrains.kotlin.android")
 }
 
 group = "com.facebook.yoga"
@@ -48,6 +49,8 @@ android {
     }
   }
 
+  kotlinOptions { jvmTarget = "1.8" }
+
   publishing {
     multipleVariants {
       withSourcesJar()
@@ -60,6 +63,7 @@ android {
 dependencies {
   implementation("com.google.code.findbugs:jsr305:3.0.2")
   implementation("com.facebook.soloader:soloader:0.10.5")
+  implementation("androidx.core:core-ktx:1.16.0")
   testImplementation("junit:junit:4.12")
 }
 

java/com/facebook/yoga/YogaConstants.java

@@ -1,25 +0,0 @@
-/*
- * Copyright (c) Meta Platforms, Inc. and affiliates.
- *
- * This source code is licensed under the MIT license found in the
- * LICENSE file in the root directory of this source tree.
- */
-
-package com.facebook.yoga;
-
-public class YogaConstants {
-
-  public static final float UNDEFINED = Float.NaN;
-
-  public static boolean isUndefined(float value) {
-    return Float.compare(value, UNDEFINED) == 0;
-  }
-
-  public static boolean isUndefined(YogaValue value) {
-    return value.unit == YogaUnit.UNDEFINED;
-  }
-
-  public static float getUndefined() {
-    return UNDEFINED;
-  }
-}

java/com/facebook/yoga/YogaConstants.kt

@@ -0,0 +1,18 @@
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+package com.facebook.yoga
+
+public object YogaConstants {
+  @JvmField public val UNDEFINED: Float = Float.NaN
+
+  @JvmStatic public fun isUndefined(value: Float): Boolean = value.compareTo(UNDEFINED) == 0
+
+  @JvmStatic public fun isUndefined(value: YogaValue): Boolean = value.unit == YogaUnit.UNDEFINED
+
+  @JvmStatic public fun getUndefined(): Float = UNDEFINED
+}

java/com/facebook/yoga/YogaDirection.java

@@ -1,35 +0,0 @@
-/*
- * Copyright (c) Meta Platforms, Inc. and affiliates.
- *
- * This source code is licensed under the MIT license found in the
- * LICENSE file in the root directory of this source tree.
- */
-
-// @generated by enums.py
-
-package com.facebook.yoga;
-
-public enum YogaDirection {
-  INHERIT(0),
-  LTR(1),
-  RTL(2);
-
-  private final int mIntValue;
-
-  YogaDirection(int intValue) {
-    mIntValue = intValue;
-  }
-
-  public int intValue() {
-    return mIntValue;
-  }
-
-  public static YogaDirection fromInt(int value) {
-    switch (value) {
-      case 0: return INHERIT;
-      case 1: return LTR;
-      case 2: return RTL;
-      default: throw new IllegalArgumentException("Unknown enum value: " + value);
-    }
-  }
-}

java/com/facebook/yoga/YogaDirection.kt

@@ -0,0 +1,29 @@
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+// @generated by enums.py
+
+package com.facebook.yoga
+
+public enum class YogaDirection(public val intValue: Int) {
+  INHERIT(0),
+  LTR(1),
+  RTL(2);
+
+  public fun intValue(): Int = intValue
+
+  public companion object {
+    @JvmStatic
+    public fun fromInt(value: Int): YogaDirection =
+        when (value) {
+          0 -> INHERIT
+          1 -> LTR
+          2 -> RTL
+          else -> throw IllegalArgumentException("Unknown enum value: $value")
+        }
+  }
+}

java/tests/generated/com/facebook/yoga/YGAlignItemsTest.java

@@ -4,7 +4,7 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  *
- * @generated SignedSource<<e8d11c0e97041bb2f1487f0d87363fdc>>
+ * @generated SignedSource<<84597dd8b2c4f3aac1f21abe68f25308>>
  * generated by gentest/gentest-driver.ts from gentest/fixtures/YGAlignItemsTest.html
  */
 
@@ -2293,6 +2293,86 @@ public class YGAlignItemsTest {
     assertEquals(50f, root_child1.getLayoutHeight(), 0.0f);
   }
 
+  @Test
+  public void test_align_items_non_stretch_s526008() {
+    YogaConfig config = YogaConfigFactory.create();
+
+    final YogaNode root = createNode(config);
+    root.setPositionType(YogaPositionType.ABSOLUTE);
+    root.setWidth(400f);
+    root.setHeight(400f);
+
+    final YogaNode root_child0 = createNode(config);
+    root_child0.setFlexDirection(YogaFlexDirection.ROW);
+    root.addChildAt(root_child0, 0);
+
+    final YogaNode root_child0_child0 = createNode(config);
+    root_child0_child0.setAlignItems(YogaAlign.FLEX_START);
+    root_child0.addChildAt(root_child0_child0, 0);
+
+    final YogaNode root_child0_child0_child0 = createNode(config);
+    root_child0_child0.addChildAt(root_child0_child0_child0, 0);
+
+    final YogaNode root_child0_child0_child0_child0 = createNode(config);
+    root_child0_child0_child0_child0.setHeight(10f);
+    root_child0_child0_child0.addChildAt(root_child0_child0_child0_child0, 0);
+    root.setDirection(YogaDirection.LTR);
+    root.calculateLayout(YogaConstants.UNDEFINED, YogaConstants.UNDEFINED);
+
+    assertEquals(0f, root.getLayoutX(), 0.0f);
+    assertEquals(0f, root.getLayoutY(), 0.0f);
+    assertEquals(400f, root.getLayoutWidth(), 0.0f);
+    assertEquals(400f, root.getLayoutHeight(), 0.0f);
+
+    assertEquals(0f, root_child0.getLayoutX(), 0.0f);
+    assertEquals(0f, root_child0.getLayoutY(), 0.0f);
+    assertEquals(400f, root_child0.getLayoutWidth(), 0.0f);
+    assertEquals(10f, root_child0.getLayoutHeight(), 0.0f);
+
+    assertEquals(0f, root_child0_child0.getLayoutX(), 0.0f);
+    assertEquals(0f, root_child0_child0.getLayoutY(), 0.0f);
+    assertEquals(0f, root_child0_child0.getLayoutWidth(), 0.0f);
+    assertEquals(10f, root_child0_child0.getLayoutHeight(), 0.0f);
+
+    assertEquals(0f, root_child0_child0_child0.getLayoutX(), 0.0f);
+    assertEquals(0f, root_child0_child0_child0.getLayoutY(), 0.0f);
+    assertEquals(0f, root_child0_child0_child0.getLayoutWidth(), 0.0f);
+    assertEquals(10f, root_child0_child0_child0.getLayoutHeight(), 0.0f);
+
+    assertEquals(0f, root_child0_child0_child0_child0.getLayoutX(), 0.0f);
+    assertEquals(0f, root_child0_child0_child0_child0.getLayoutY(), 0.0f);
+    assertEquals(0f, root_child0_child0_child0_child0.getLayoutWidth(), 0.0f);
+    assertEquals(10f, root_child0_child0_child0_child0.getLayoutHeight(), 0.0f);
+
+    root.setDirection(YogaDirection.RTL);
+    root.calculateLayout(YogaConstants.UNDEFINED, YogaConstants.UNDEFINED);
+
+    assertEquals(0f, root.getLayoutX(), 0.0f);
+    assertEquals(0f, root.getLayoutY(), 0.0f);
+    assertEquals(400f, root.getLayoutWidth(), 0.0f);
+    assertEquals(400f, root.getLayoutHeight(), 0.0f);
+
+    assertEquals(0f, root_child0.getLayoutX(), 0.0f);
+    assertEquals(0f, root_child0.getLayoutY(), 0.0f);
+    assertEquals(400f, root_child0.getLayoutWidth(), 0.0f);
+    assertEquals(10f, root_child0.getLayoutHeight(), 0.0f);
+
+    assertEquals(400f, root_child0_child0.getLayoutX(), 0.0f);
+    assertEquals(0f, root_child0_child0.getLayoutY(), 0.0f);
+    assertEquals(0f, root_child0_child0.getLayoutWidth(), 0.0f);
+    assertEquals(10f, root_child0_child0.getLayoutHeight(), 0.0f);
+
+    assertEquals(0f, root_child0_child0_child0.getLayoutX(), 0.0f);
+    assertEquals(0f, root_child0_child0_child0.getLayoutY(), 0.0f);
+    assertEquals(0f, root_child0_child0_child0.getLayoutWidth(), 0.0f);
+    assertEquals(10f, root_child0_child0_child0.getLayoutHeight(), 0.0f);
+
+    assertEquals(0f, root_child0_child0_child0_child0.getLayoutX(), 0.0f);
+    assertEquals(0f, root_child0_child0_child0_child0.getLayoutY(), 0.0f);
+    assertEquals(0f, root_child0_child0_child0_child0.getLayoutWidth(), 0.0f);
+    assertEquals(10f, root_child0_child0_child0_child0.getLayoutHeight(), 0.0f);
+  }
+
   private YogaNode createNode(YogaConfig config) {
     return mNodeFactory.create(config);
   }

javascript/tests/generated/YGAlignItemsTest.test.ts

@@ -4,7 +4,7 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  *
- * @generated SignedSource<<075a0b67003e5c4a1f51bd99da71c700>>
+ * @generated SignedSource<<fd80af208d8635435f86ffa8f3810b39>>
  * generated by gentest/gentest-driver.ts from gentest/fixtures/YGAlignItemsTest.html
  */
 
@@ -2442,3 +2442,88 @@ test('align_stretch_with_row_reverse', () => {
     config.free();
   }
 });
+test('align_items_non_stretch_s526008', () => {
+  const config = Yoga.Config.create();
+  let root;
+
+  try {
+    root = Yoga.Node.create(config);
+    root.setPositionType(PositionType.Absolute);
+    root.setWidth(400);
+    root.setHeight(400);
+
+    const root_child0 = Yoga.Node.create(config);
+    root_child0.setFlexDirection(FlexDirection.Row);
+    root.insertChild(root_child0, 0);
+
+    const root_child0_child0 = Yoga.Node.create(config);
+    root_child0_child0.setAlignItems(Align.FlexStart);
+    root_child0.insertChild(root_child0_child0, 0);
+
+    const root_child0_child0_child0 = Yoga.Node.create(config);
+    root_child0_child0.insertChild(root_child0_child0_child0, 0);
+
+    const root_child0_child0_child0_child0 = Yoga.Node.create(config);
+    root_child0_child0_child0_child0.setHeight(10);
+    root_child0_child0_child0.insertChild(root_child0_child0_child0_child0, 0);
+    root.calculateLayout(undefined, undefined, Direction.LTR);
+
+    expect(root.getComputedLeft()).toBe(0);
+    expect(root.getComputedTop()).toBe(0);
+    expect(root.getComputedWidth()).toBe(400);
+    expect(root.getComputedHeight()).toBe(400);
+
+    expect(root_child0.getComputedLeft()).toBe(0);
+    expect(root_child0.getComputedTop()).toBe(0);
+    expect(root_child0.getComputedWidth()).toBe(400);
+    expect(root_child0.getComputedHeight()).toBe(10);
+
+    expect(root_child0_child0.getComputedLeft()).toBe(0);
+    expect(root_child0_child0.getComputedTop()).toBe(0);
+    expect(root_child0_child0.getComputedWidth()).toBe(0);
+    expect(root_child0_child0.getComputedHeight()).toBe(10);
+
+    expect(root_child0_child0_child0.getComputedLeft()).toBe(0);
+    expect(root_child0_child0_child0.getComputedTop()).toBe(0);
+    expect(root_child0_child0_child0.getComputedWidth()).toBe(0);
+    expect(root_child0_child0_child0.getComputedHeight()).toBe(10);
+
+    expect(root_child0_child0_child0_child0.getComputedLeft()).toBe(0);
+    expect(root_child0_child0_child0_child0.getComputedTop()).toBe(0);
+    expect(root_child0_child0_child0_child0.getComputedWidth()).toBe(0);
+    expect(root_child0_child0_child0_child0.getComputedHeight()).toBe(10);
+
+    root.calculateLayout(undefined, undefined, Direction.RTL);
+
+    expect(root.getComputedLeft()).toBe(0);
+    expect(root.getComputedTop()).toBe(0);
+    expect(root.getComputedWidth()).toBe(400);
+    expect(root.getComputedHeight()).toBe(400);
+
+    expect(root_child0.getComputedLeft()).toBe(0);
+    expect(root_child0.getComputedTop()).toBe(0);
+    expect(root_child0.getComputedWidth()).toBe(400);
+    expect(root_child0.getComputedHeight()).toBe(10);
+
+    expect(root_child0_child0.getComputedLeft()).toBe(400);
+    expect(root_child0_child0.getComputedTop()).toBe(0);
+    expect(root_child0_child0.getComputedWidth()).toBe(0);
+    expect(root_child0_child0.getComputedHeight()).toBe(10);
+
+    expect(root_child0_child0_child0.getComputedLeft()).toBe(0);
+    expect(root_child0_child0_child0.getComputedTop()).toBe(0);
+    expect(root_child0_child0_child0.getComputedWidth()).toBe(0);
+    expect(root_child0_child0_child0.getComputedHeight()).toBe(10);
+
+    expect(root_child0_child0_child0_child0.getComputedLeft()).toBe(0);
+    expect(root_child0_child0_child0_child0.getComputedTop()).toBe(0);
+    expect(root_child0_child0_child0_child0.getComputedWidth()).toBe(0);
+    expect(root_child0_child0_child0_child0.getComputedHeight()).toBe(10);
+  } finally {
+    if (typeof root !== 'undefined') {
+      root.freeRecursive();
+    }
+
+    config.free();
+  }
+});

settings.gradle.kts

@@ -19,10 +19,11 @@ include(":yoga")
 
 project(":yoga").projectDir = file("java")
 
-rootProject.name = "yoga-github"
-
-// If you specify a file inside gradle/gradle-enterprise.gradle.kts
-// you can configure your custom Gradle Enterprise instance
-if (file("./gradle/gradle-enterprise.gradle.kts").exists()) {
-  apply(from = "./gradle/gradle-enterprise.gradle.kts")
+gradleEnterprise {
+  buildScan {
+    termsOfServiceUrl = "https://gradle.com/terms-of-service"
+    termsOfServiceAgree = "yes"
   }
+}
+
+rootProject.name = "yoga-github"

tests/.clang-tidy

@@ -0,0 +1,7 @@
+---
+InheritParentConfig: true
+Checks: '
+-facebook-hte-CArray,
+-modernize-avoid-c-arrays,
+'
+...

tests/YGPersistentNodeCloningTest.cpp

@@ -0,0 +1,214 @@
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#include <gtest/gtest.h>
+#include <yoga/Yoga.h>
+#include <yoga/config/Config.h>
+#include <yoga/node/Node.h>
+
+#include <functional>
+#include <memory>
+#include <vector>
+
+namespace facebook::yoga {
+
+struct YGPersistentNodeCloningTest : public ::testing::Test {
+  struct NodeWrapper {
+    explicit NodeWrapper(
+        YGConfigRef config,
+        std::vector<std::shared_ptr<NodeWrapper>> children = {})
+        : node{YGNodeNewWithConfig(config)}, children{std::move(children)} {
+      YGNodeSetContext(node, this);
+
+      auto privateNode = resolveRef(node);
+      for (const auto& child : this->children) {
+        auto privateChild = resolveRef(child->node);
+        // Claim first ownership of not yet owned nodes, to avoid immediately
+        // cloning them
+        if (YGNodeGetOwner(child->node) == nullptr) {
+          privateChild->setOwner(privateNode);
+        }
+        privateNode->insertChild(privateChild, privateNode->getChildCount());
+      }
+    }
+
+    // Clone, with current children, for mutation
+    NodeWrapper(const NodeWrapper& other)
+        : node{YGNodeClone(other.node)}, children{other.children} {
+      YGNodeSetContext(node, this);
+
+      auto privateNode = resolveRef(node);
+      privateNode->setOwner(nullptr);
+    }
+
+    // Clone, with new children
+    NodeWrapper(
+        const NodeWrapper& other,
+        std::vector<std::shared_ptr<NodeWrapper>> children)
+        : node{YGNodeClone(other.node)}, children{std::move(children)} {
+      YGNodeSetContext(node, this);
+
+      auto privateNode = resolveRef(node);
+      privateNode->setOwner(nullptr);
+      privateNode->setChildren({});
+      privateNode->setDirty(true);
+
+      for (const auto& child : this->children) {
+        auto privateChild = resolveRef(child->node);
+        // Claim first ownership of not yet owned nodes, to avoid immediately
+        // cloning them
+        if (YGNodeGetOwner(child->node) == nullptr) {
+          privateChild->setOwner(privateNode);
+        }
+        privateNode->insertChild(privateChild, privateNode->getChildCount());
+      }
+    }
+
+    NodeWrapper(NodeWrapper&&) = delete;
+
+    ~NodeWrapper() {
+      YGNodeFree(node);
+    }
+
+    NodeWrapper& operator=(const NodeWrapper& other) = delete;
+    NodeWrapper& operator=(NodeWrapper&& other) = delete;
+
+    YGNodeRef node;
+    std::vector<std::shared_ptr<NodeWrapper>> children;
+  };
+
+  struct ConfigWrapper {
+    ConfigWrapper() {
+      YGConfigSetCloneNodeFunc(
+          config,
+          [](YGNodeConstRef oldNode, YGNodeConstRef owner, size_t childIndex) {
+            onClone(oldNode, owner, childIndex);
+            auto wrapper = static_cast<NodeWrapper*>(YGNodeGetContext(owner));
+            auto old = static_cast<NodeWrapper*>(YGNodeGetContext(oldNode));
+
+            wrapper->children[childIndex] = std::make_shared<NodeWrapper>(*old);
+            return wrapper->children[childIndex]->node;
+          });
+    }
+
+    ConfigWrapper(const ConfigWrapper&) = delete;
+    ConfigWrapper(ConfigWrapper&&) = delete;
+
+    ~ConfigWrapper() {
+      YGConfigFree(config);
+    }
+
+    ConfigWrapper& operator=(const ConfigWrapper&) = delete;
+    ConfigWrapper& operator=(ConfigWrapper&&) = delete;
+
+    YGConfigRef config{YGConfigNew()};
+  };
+
+  ConfigWrapper configWrapper;
+  YGConfigRef config{configWrapper.config};
+
+  void SetUp() override {
+    onClone = [](...) {};
+  }
+
+  // NOLINTNEXTLINE(cppcoreguidelines-avoid-non-const-global-variables)
+  static inline std::function<void(YGNodeConstRef, YGNodeConstRef, size_t)>
+      onClone;
+};
+
+TEST_F(
+    YGPersistentNodeCloningTest,
+    changing_sibling_height_does_not_clone_neighbors) {
+  // <ScrollView>
+  //   <View id="Sibling" style={{ height: 1 }} />
+  //   <View id="A" style={{ height: 1 }}>
+  //     <View id="B">
+  //       <View id="C">
+  //         <View id="D"/>
+  //       </View>
+  //     </View>
+  //   </View>
+  // </ScrollView>
+
+  auto sibling = std::make_shared<NodeWrapper>(config);
+  YGNodeStyleSetHeight(sibling->node, 1);
+
+  auto d = std::make_shared<NodeWrapper>(config);
+  auto c = std::make_shared<NodeWrapper>(config, std::vector{d});
+  auto b = std::make_shared<NodeWrapper>(config, std::vector{c});
+  auto a = std::make_shared<NodeWrapper>(config, std::vector{b});
+  YGNodeStyleSetHeight(a->node, 1);
+
+  auto scrollContentView =
+      std::make_shared<NodeWrapper>(config, std::vector{sibling, a});
+  YGNodeStyleSetPositionType(scrollContentView->node, YGPositionTypeAbsolute);
+
+  auto scrollView =
+      std::make_shared<NodeWrapper>(config, std::vector{scrollContentView});
+  YGNodeStyleSetWidth(scrollView->node, 100);
+  YGNodeStyleSetHeight(scrollView->node, 100);
+
+  // We don't expect any cloning during the first layout
+  onClone = [](...) { FAIL(); };
+
+  YGNodeCalculateLayout(
+      scrollView->node, YGUndefined, YGUndefined, YGDirectionLTR);
+
+  auto siblingPrime = std::make_shared<NodeWrapper>(config);
+  YGNodeStyleSetHeight(siblingPrime->node, 2);
+
+  auto scrollContentViewPrime = std::make_shared<NodeWrapper>(
+      *scrollContentView, std::vector{siblingPrime, a});
+  auto scrollViewPrime = std::make_shared<NodeWrapper>(
+      *scrollView, std::vector{scrollContentViewPrime});
+
+  std::vector<NodeWrapper*> nodesCloned;
+  // We should only need to clone "A"
+  onClone = [&](YGNodeConstRef oldNode,
+                YGNodeConstRef /*owner*/,
+                size_t /*childIndex*/) {
+    nodesCloned.push_back(static_cast<NodeWrapper*>(YGNodeGetContext(oldNode)));
+  };
+
+  YGNodeCalculateLayout(
+      scrollViewPrime->node, YGUndefined, YGUndefined, YGDirectionLTR);
+
+  EXPECT_EQ(nodesCloned.size(), 1);
+  EXPECT_EQ(nodesCloned[0], a.get());
+}
+
+TEST_F(YGPersistentNodeCloningTest, clone_leaf_display_contents_node) {
+  // <View id="A">
+  //   <View id="B" style={{ display: 'contents' }} />
+  // </View>
+
+  auto b = std::make_shared<NodeWrapper>(config);
+  auto a = std::make_shared<NodeWrapper>(config, std::vector{b});
+  YGNodeStyleSetDisplay(b->node, YGDisplayContents);
+
+  // We don't expect any cloning during the first layout
+  onClone = [](...) { FAIL(); };
+
+  YGNodeCalculateLayout(a->node, YGUndefined, YGUndefined, YGDirectionLTR);
+
+  auto aPrime = std::make_shared<NodeWrapper>(config, std::vector{b});
+
+  std::vector<NodeWrapper*> nodesCloned;
+  // We should clone "C"
+  onClone = [&](YGNodeConstRef oldNode,
+                YGNodeConstRef /*owner*/,
+                size_t /*childIndex*/) {
+    nodesCloned.push_back(static_cast<NodeWrapper*>(YGNodeGetContext(oldNode)));
+  };
+
+  YGNodeCalculateLayout(aPrime->node, 100, 100, YGDirectionLTR);
+
+  EXPECT_EQ(nodesCloned.size(), 1);
+  EXPECT_EQ(nodesCloned[0], b.get());
+}
+
+} // namespace facebook::yoga

tests/YGRoundingFunctionTest.cpp

@@ -161,3 +161,23 @@ TEST(YogaTest, per_node_point_scale_factor) {
   YGConfigFree(config2);
   YGConfigFree(config3);
 }
+
+TEST(YogaTest, raw_layout_dimensions) {
+  YGConfigRef config = YGConfigNew();
+  YGConfigSetPointScaleFactor(config, 0.5f);
+
+  YGNodeRef root = YGNodeNewWithConfig(config);
+  YGNodeStyleSetWidth(root, 11.5f);
+  YGNodeStyleSetHeight(root, 9.5f);
+
+  YGNodeCalculateLayout(root, YGUndefined, YGUndefined, YGDirectionLTR);
+
+  ASSERT_EQ(YGNodeLayoutGetWidth(root), 12.0f);
+  ASSERT_EQ(YGNodeLayoutGetHeight(root), 10.0f);
+  ASSERT_EQ(YGNodeLayoutGetRawWidth(root), 11.5f);
+  ASSERT_EQ(YGNodeLayoutGetRawHeight(root), 9.5f);
+
+  YGNodeFreeRecursive(root);
+
+  YGConfigFree(config);
+}

tests/generated/YGAlignItemsTest.cpp

@@ -5,7 +5,7 @@
  * LICENSE file in the root directory of this source tree.
  *
  * clang-format off
- * @generated SignedSource<<71295a398c89ea424490884a05e2c77c>>
+ * @generated SignedSource<<1db57b05babb408c08efcec7dbdf16fb>>
  * generated by gentest/gentest-driver.ts from gentest/fixtures/YGAlignItemsTest.html
  */
 
@@ -2310,3 +2310,84 @@ TEST(YogaTest, align_stretch_with_row_reverse) {
 
   YGConfigFree(config);
 }
+
+TEST(YogaTest, align_items_non_stretch_s526008) {
+  YGConfigRef config = YGConfigNew();
+
+  YGNodeRef root = YGNodeNewWithConfig(config);
+  YGNodeStyleSetPositionType(root, YGPositionTypeAbsolute);
+  YGNodeStyleSetWidth(root, 400);
+  YGNodeStyleSetHeight(root, 400);
+
+  YGNodeRef root_child0 = YGNodeNewWithConfig(config);
+  YGNodeStyleSetFlexDirection(root_child0, YGFlexDirectionRow);
+  YGNodeInsertChild(root, root_child0, 0);
+
+  YGNodeRef root_child0_child0 = YGNodeNewWithConfig(config);
+  YGNodeStyleSetAlignItems(root_child0_child0, YGAlignFlexStart);
+  YGNodeInsertChild(root_child0, root_child0_child0, 0);
+
+  YGNodeRef root_child0_child0_child0 = YGNodeNewWithConfig(config);
+  YGNodeInsertChild(root_child0_child0, root_child0_child0_child0, 0);
+
+  YGNodeRef root_child0_child0_child0_child0 = YGNodeNewWithConfig(config);
+  YGNodeStyleSetHeight(root_child0_child0_child0_child0, 10);
+  YGNodeInsertChild(root_child0_child0_child0, root_child0_child0_child0_child0, 0);
+  YGNodeCalculateLayout(root, YGUndefined, YGUndefined, YGDirectionLTR);
+
+  ASSERT_FLOAT_EQ(0, YGNodeLayoutGetLeft(root));
+  ASSERT_FLOAT_EQ(0, YGNodeLayoutGetTop(root));
+  ASSERT_FLOAT_EQ(400, YGNodeLayoutGetWidth(root));
+  ASSERT_FLOAT_EQ(400, YGNodeLayoutGetHeight(root));
+
+  ASSERT_FLOAT_EQ(0, YGNodeLayoutGetLeft(root_child0));
+  ASSERT_FLOAT_EQ(0, YGNodeLayoutGetTop(root_child0));
+  ASSERT_FLOAT_EQ(400, YGNodeLayoutGetWidth(root_child0));
+  ASSERT_FLOAT_EQ(10, YGNodeLayoutGetHeight(root_child0));
+
+  ASSERT_FLOAT_EQ(0, YGNodeLayoutGetLeft(root_child0_child0));
+  ASSERT_FLOAT_EQ(0, YGNodeLayoutGetTop(root_child0_child0));
+  ASSERT_FLOAT_EQ(0, YGNodeLayoutGetWidth(root_child0_child0));
+  ASSERT_FLOAT_EQ(10, YGNodeLayoutGetHeight(root_child0_child0));
+
+  ASSERT_FLOAT_EQ(0, YGNodeLayoutGetLeft(root_child0_child0_child0));
+  ASSERT_FLOAT_EQ(0, YGNodeLayoutGetTop(root_child0_child0_child0));
+  ASSERT_FLOAT_EQ(0, YGNodeLayoutGetWidth(root_child0_child0_child0));
+  ASSERT_FLOAT_EQ(10, YGNodeLayoutGetHeight(root_child0_child0_child0));
+
+  ASSERT_FLOAT_EQ(0, YGNodeLayoutGetLeft(root_child0_child0_child0_child0));
+  ASSERT_FLOAT_EQ(0, YGNodeLayoutGetTop(root_child0_child0_child0_child0));
+  ASSERT_FLOAT_EQ(0, YGNodeLayoutGetWidth(root_child0_child0_child0_child0));
+  ASSERT_FLOAT_EQ(10, YGNodeLayoutGetHeight(root_child0_child0_child0_child0));
+
+  YGNodeCalculateLayout(root, YGUndefined, YGUndefined, YGDirectionRTL);
+
+  ASSERT_FLOAT_EQ(0, YGNodeLayoutGetLeft(root));
+  ASSERT_FLOAT_EQ(0, YGNodeLayoutGetTop(root));
+  ASSERT_FLOAT_EQ(400, YGNodeLayoutGetWidth(root));
+  ASSERT_FLOAT_EQ(400, YGNodeLayoutGetHeight(root));
+
+  ASSERT_FLOAT_EQ(0, YGNodeLayoutGetLeft(root_child0));
+  ASSERT_FLOAT_EQ(0, YGNodeLayoutGetTop(root_child0));
+  ASSERT_FLOAT_EQ(400, YGNodeLayoutGetWidth(root_child0));
+  ASSERT_FLOAT_EQ(10, YGNodeLayoutGetHeight(root_child0));
+
+  ASSERT_FLOAT_EQ(400, YGNodeLayoutGetLeft(root_child0_child0));
+  ASSERT_FLOAT_EQ(0, YGNodeLayoutGetTop(root_child0_child0));
+  ASSERT_FLOAT_EQ(0, YGNodeLayoutGetWidth(root_child0_child0));
+  ASSERT_FLOAT_EQ(10, YGNodeLayoutGetHeight(root_child0_child0));
+
+  ASSERT_FLOAT_EQ(0, YGNodeLayoutGetLeft(root_child0_child0_child0));
+  ASSERT_FLOAT_EQ(0, YGNodeLayoutGetTop(root_child0_child0_child0));
+  ASSERT_FLOAT_EQ(0, YGNodeLayoutGetWidth(root_child0_child0_child0));
+  ASSERT_FLOAT_EQ(10, YGNodeLayoutGetHeight(root_child0_child0_child0));
+
+  ASSERT_FLOAT_EQ(0, YGNodeLayoutGetLeft(root_child0_child0_child0_child0));
+  ASSERT_FLOAT_EQ(0, YGNodeLayoutGetTop(root_child0_child0_child0_child0));
+  ASSERT_FLOAT_EQ(0, YGNodeLayoutGetWidth(root_child0_child0_child0_child0));
+  ASSERT_FLOAT_EQ(10, YGNodeLayoutGetHeight(root_child0_child0_child0_child0));
+
+  YGNodeFreeRecursive(root);
+
+  YGConfigFree(config);
+}

website/docs/styling/align-content.mdx

@@ -17,15 +17,15 @@ has effect when items are wrapped to multiple lines using [flex wrap](/docs/styl
 
 **Center**: Align wrapped lines in the center of the container's cross axis.
 
-**Space between**: Evenly space wrapped lines across the container's main axis, distributing
+**Space between**: Evenly space wrapped lines across the container's cross axis, distributing
 remaining space between the lines.
 
-**Space around**: Evenly space wrapped lines across the container's main axis, distributing
+**Space around**: Evenly space wrapped lines across the container's cross axis, distributing
 remaining space around the lines. Compared to space between using
 space around will result in space being distributed to the beginning of
 the first lines and end of the last line.
 
-**Space evenly**: Evenly space wrapped lines across the container's main axis, distributing
+**Space evenly**: Evenly space wrapped lines across the container's cross axis, distributing
 remaining space around the lines. Compared to space around, space evenly will not
 double the gaps between children. The size of gaps between children and between
 the parent's edges and the first/last child will all be equal.

yoga/YGNodeLayout.cpp

@@ -90,3 +90,11 @@ float YGNodeLayoutGetPadding(YGNodeConstRef node, YGEdge edge) {
   return getResolvedLayoutProperty<&LayoutResults::padding>(
       node, scopedEnum(edge));
 }
+
+float YGNodeLayoutGetRawHeight(YGNodeConstRef node) {
+  return resolveRef(node)->getLayout().rawDimension(Dimension::Height);
+}
+
+float YGNodeLayoutGetRawWidth(YGNodeConstRef node) {
+  return resolveRef(node)->getLayout().rawDimension(Dimension::Width);
+}

yoga/YGNodeLayout.h

@@ -32,4 +32,14 @@ YG_EXPORT float YGNodeLayoutGetMargin(YGNodeConstRef node, YGEdge edge);
 YG_EXPORT float YGNodeLayoutGetBorder(YGNodeConstRef node, YGEdge edge);
 YG_EXPORT float YGNodeLayoutGetPadding(YGNodeConstRef node, YGEdge edge);
 
+/**
+ * Return the measured height of the node, before layout rounding
+ */
+YG_EXPORT float YGNodeLayoutGetRawHeight(YGNodeConstRef node);
+
+/**
+ * Return the measured width of the node, before layout rounding
+ */
+YG_EXPORT float YGNodeLayoutGetRawWidth(YGNodeConstRef node);
+
 YG_EXTERN_C_END

yoga/YGValue.h

@@ -72,10 +72,10 @@ inline bool operator==(const YGValue& lhs, const YGValue& rhs) {
     case YGUnitPoint:
     case YGUnitPercent:
       return lhs.value == rhs.value;
-  }
-
+    default:
       return false;
   }
+}
 
 inline bool operator!=(const YGValue& lhs, const YGValue& rhs) {
   return !(lhs == rhs);

yoga/Yoga.h

@@ -11,11 +11,11 @@
  * `#include <yoga/Yoga.h>` includes all of Yoga's public headers.
  */
 
-#include <yoga/YGConfig.h>
-#include <yoga/YGEnums.h>
-#include <yoga/YGMacros.h>
-#include <yoga/YGNode.h>
-#include <yoga/YGNodeLayout.h>
-#include <yoga/YGNodeStyle.h>
-#include <yoga/YGPixelGrid.h>
-#include <yoga/YGValue.h>
+#include <yoga/YGConfig.h> // IWYU pragma: export
+#include <yoga/YGEnums.h> // IWYU pragma: export
+#include <yoga/YGMacros.h> // IWYU pragma: export
+#include <yoga/YGNode.h> // IWYU pragma: export
+#include <yoga/YGNodeLayout.h> // IWYU pragma: export
+#include <yoga/YGNodeStyle.h> // IWYU pragma: export
+#include <yoga/YGPixelGrid.h> // IWYU pragma: export
+#include <yoga/YGValue.h> // IWYU pragma: export

yoga/algorithm/CalculateLayout.cpp

@@ -415,6 +415,12 @@ static void measureNodeWithoutChildren(
       Dimension::Height);
 }
 
+inline bool isFixedSize(float dim, SizingMode sizingMode) {
+  return sizingMode == SizingMode::StretchFit ||
+      (yoga::isDefined(dim) && sizingMode == SizingMode::FitContent &&
+       dim <= 0.0);
+}
+
 static bool measureNodeWithFixedSize(
     yoga::Node* const node,
     const Direction direction,
@@ -424,12 +430,8 @@ static bool measureNodeWithFixedSize(
     const SizingMode heightSizingMode,
     const float ownerWidth,
     const float ownerHeight) {
-  if ((yoga::isDefined(availableWidth) &&
-       widthSizingMode == SizingMode::FitContent && availableWidth <= 0.0f) ||
-      (yoga::isDefined(availableHeight) &&
-       heightSizingMode == SizingMode::FitContent && availableHeight <= 0.0f) ||
-      (widthSizingMode == SizingMode::StretchFit &&
-       heightSizingMode == SizingMode::StretchFit)) {
+  if (isFixedSize(availableWidth, widthSizingMode) &&
+      isFixedSize(availableHeight, heightSizingMode)) {
     node->setLayoutMeasuredDimension(
         boundAxis(
             node,
@@ -476,6 +478,8 @@ static void zeroOutLayoutRecursively(yoga::Node* const node) {
 }
 
 static void cleanupContentsNodesRecursively(yoga::Node* const node) {
+  if (node->hasContentsChildren()) [[unlikely]] {
+    node->cloneContentsChildrenIfNeeded();
     for (auto child : node->getChildren()) {
       if (child->style().display() == Display::Contents) {
         child->getLayout() = {};
@@ -489,6 +493,7 @@ static void cleanupContentsNodesRecursively(yoga::Node* const node) {
       }
     }
   }
+}
 
 static float calculateAvailableInnerDimension(
     const yoga::Node* const node,

yoga/algorithm/PixelGrid.cpp

@@ -106,25 +106,25 @@ void roundLayoutResultsToPixelGrid(
     const bool hasFractionalHeight =
         !yoga::inexactEquals(round(scaledNodeHeight), scaledNodeHeight);
 
-    node->setLayoutDimension(
+    node->getLayout().setDimension(
+        Dimension::Width,
         roundValueToPixelGrid(
             absoluteNodeRight,
             pointScaleFactor,
             (textRounding && hasFractionalWidth),
             (textRounding && !hasFractionalWidth)) -
             roundValueToPixelGrid(
-                absoluteNodeLeft, pointScaleFactor, false, textRounding),
-        Dimension::Width);
+                absoluteNodeLeft, pointScaleFactor, false, textRounding));
 
-    node->setLayoutDimension(
+    node->getLayout().setDimension(
+        Dimension::Height,
         roundValueToPixelGrid(
             absoluteNodeBottom,
             pointScaleFactor,
             (textRounding && hasFractionalHeight),
             (textRounding && !hasFractionalHeight)) -
             roundValueToPixelGrid(
-                absoluteNodeTop, pointScaleFactor, false, textRounding),
-        Dimension::Height);
+                absoluteNodeTop, pointScaleFactor, false, textRounding));
   }
 
   for (yoga::Node* child : node->getChildren()) {

yoga/debug/AssertFatal.cpp

@@ -19,6 +19,7 @@ namespace facebook::yoga {
 #if defined(__cpp_exceptions)
   throw std::logic_error(message);
 #else
+  static_cast<void>(message); // Unused
   std::terminate();
 #endif
 }

yoga/event/event.h

@@ -36,12 +36,12 @@ enum struct LayoutPassReason : int {
 };
 
 struct LayoutData {
-  int layouts;
-  int measures;
-  uint32_t maxMeasureCache;
-  int cachedLayouts;
-  int cachedMeasures;
-  int measureCallbacks;
+  int layouts = 0;
+  int measures = 0;
+  uint32_t maxMeasureCache = 0;
+  int cachedLayouts = 0;
+  int cachedMeasures = 0;
+  int measureCallbacks = 0;
   std::array<int, static_cast<uint8_t>(LayoutPassReason::COUNT)>
       measureCallbackReasonsCount;
 };

yoga/node/LayoutResults.h

@@ -66,10 +66,18 @@ struct LayoutResults {
     return measuredDimensions_[yoga::to_underlying(axis)];
   }
 
+  float rawDimension(Dimension axis) const {
+    return rawDimensions_[yoga::to_underlying(axis)];
+  }
+
   void setMeasuredDimension(Dimension axis, float dimension) {
     measuredDimensions_[yoga::to_underlying(axis)] = dimension;
   }
 
+  void setRawDimension(Dimension axis, float dimension) {
+    rawDimensions_[yoga::to_underlying(axis)] = dimension;
+  }
+
   float position(PhysicalEdge physicalEdge) const {
     return position_[yoga::to_underlying(physicalEdge)];
   }
@@ -113,6 +121,7 @@ struct LayoutResults {
 
   std::array<float, 2> dimensions_ = {{YGUndefined, YGUndefined}};
   std::array<float, 2> measuredDimensions_ = {{YGUndefined, YGUndefined}};
+  std::array<float, 2> rawDimensions_ = {{YGUndefined, YGUndefined}};
   std::array<float, 4> position_ = {};
   std::array<float, 4> margin_ = {};
   std::array<float, 4> border_ = {};

yoga/node/Node.cpp

@@ -181,6 +181,17 @@ void Node::setDirty(bool isDirty) {
   }
 }
 
+void Node::setChildren(const std::vector<Node*>& children) {
+  children_ = children;
+
+  contentsChildrenCount_ = 0;
+  for (const auto& child : children) {
+    if (child->style().display() == Display::Contents) {
+      contentsChildrenCount_++;
+    }
+  }
+}
+
 bool Node::removeChild(Node* child) {
   auto p = std::find(children_.begin(), children_.end(), child);
   if (p != children_.end()) {
@@ -247,6 +258,7 @@ void Node::setLayoutHadOverflow(bool hadOverflow) {
 
 void Node::setLayoutDimension(float lengthValue, Dimension dimension) {
   layout_.setDimension(dimension, lengthValue);
+  layout_.setRawDimension(dimension, lengthValue);
 }
 
 // If both left and right are defined, then use left. Otherwise return +left or
@@ -379,6 +391,23 @@ void Node::cloneChildrenIfNeeded() {
     if (child->getOwner() != this) {
       child = resolveRef(config_->cloneNode(child, this, i));
       child->setOwner(this);
+
+      if (child->hasContentsChildren()) [[unlikely]] {
+        child->cloneContentsChildrenIfNeeded();
+      }
+    }
+    i += 1;
+  }
+}
+
+void Node::cloneContentsChildrenIfNeeded() {
+  size_t i = 0;
+  for (Node*& child : children_) {
+    if (child->style().display() == Display::Contents &&
+        child->getOwner() != this) {
+      child = resolveRef(config_->cloneNode(child, this, i));
+      child->setOwner(this);
+      child->cloneChildrenIfNeeded();
     }
     i += 1;
   }

yoga/node/Node.h

@@ -96,6 +96,10 @@ class YG_EXPORT Node : public ::YGNode {
     return config_->hasErrata(errata);
   }
 
+  bool hasContentsChildren() const {
+    return contentsChildrenCount_ != 0;
+  }
+
   YGDirtiedFunc getDirtiedFunc() const {
     return dirtiedFunc_;
   }
@@ -244,15 +248,12 @@ class YG_EXPORT Node : public ::YGNode {
     owner_ = owner;
   }
 
-  void setChildren(const std::vector<Node*>& children) {
-    children_ = children;
-  }
-
   // TODO: rvalue override for setChildren
 
   void setConfig(Config* config);
 
   void setDirty(bool isDirty);
+  void setChildren(const std::vector<Node*>& children);
   void setLayoutLastOwnerDirection(Direction direction);
   void setLayoutComputedFlexBasis(FloatOptional computedFlexBasis);
   void setLayoutComputedFlexBasisGeneration(
@@ -286,6 +287,7 @@ class YG_EXPORT Node : public ::YGNode {
   void removeChild(size_t index);
 
   void cloneChildrenIfNeeded();
+  void cloneContentsChildrenIfNeeded();
   void markDirtyAndPropagate();
   float resolveFlexGrow() const;
   float resolveFlexShrink() const;