Fix align-content strech with multiple lines

Summary: This is an update of facebook/yoga#368 which was reverted. It fixes support for align-content: strech with multiple lines. The problem with the last attempt at solving this was that align-items:stretch was interfering. We handle this now by detecting when the flex basis of the children hints at them overflowing. This is not 100% correct as the size of the items could change when remeasuring but it will work in 99% of cases.

Reviewed By: astreet

Differential Revision: D4551234

fbshipit-source-id: 2964f19cf415991dc55dfa2caa4868cb00c56bd0

csharp/tests/Facebook.Yoga/YGFlexWrapTest.cs

@@ -410,5 +410,139 @@ namespace Facebook.Yoga
             Assert.AreEqual(50f, root_child1.LayoutHeight);
         }
 
+        [Test]
+        public void Test_flex_wrap_wrap_to_child_height()
+        {
+            YogaNode root = new YogaNode();
+
+            YogaNode root_child0 = new YogaNode();
+            root_child0.FlexDirection = YogaFlexDirection.Row;
+            root_child0.AlignItems = YogaAlign.FlexStart;
+            root_child0.Wrap = YogaWrap.Wrap;
+            root.Insert(0, root_child0);
+
+            YogaNode root_child0_child0 = new YogaNode();
+            root_child0_child0.Width = 100;
+            root_child0.Insert(0, root_child0_child0);
+
+            YogaNode root_child0_child0_child0 = new YogaNode();
+            root_child0_child0_child0.Width = 100;
+            root_child0_child0_child0.Height = 100;
+            root_child0_child0.Insert(0, root_child0_child0_child0);
+
+            YogaNode root_child1 = new YogaNode();
+            root_child1.Width = 100;
+            root_child1.Height = 100;
+            root.Insert(1, root_child1);
+            root.StyleDirection = YogaDirection.LTR;
+            root.CalculateLayout();
+
+            Assert.AreEqual(0f, root.LayoutX);
+            Assert.AreEqual(0f, root.LayoutY);
+            Assert.AreEqual(100f, root.LayoutWidth);
+            Assert.AreEqual(200f, root.LayoutHeight);
+
+            Assert.AreEqual(0f, root_child0.LayoutX);
+            Assert.AreEqual(0f, root_child0.LayoutY);
+            Assert.AreEqual(100f, root_child0.LayoutWidth);
+            Assert.AreEqual(100f, root_child0.LayoutHeight);
+
+            Assert.AreEqual(0f, root_child0_child0.LayoutX);
+            Assert.AreEqual(0f, root_child0_child0.LayoutY);
+            Assert.AreEqual(100f, root_child0_child0.LayoutWidth);
+            Assert.AreEqual(100f, root_child0_child0.LayoutHeight);
+
+            Assert.AreEqual(0f, root_child0_child0_child0.LayoutX);
+            Assert.AreEqual(0f, root_child0_child0_child0.LayoutY);
+            Assert.AreEqual(100f, root_child0_child0_child0.LayoutWidth);
+            Assert.AreEqual(100f, root_child0_child0_child0.LayoutHeight);
+
+            Assert.AreEqual(0f, root_child1.LayoutX);
+            Assert.AreEqual(100f, root_child1.LayoutY);
+            Assert.AreEqual(100f, root_child1.LayoutWidth);
+            Assert.AreEqual(100f, root_child1.LayoutHeight);
+
+            root.StyleDirection = YogaDirection.RTL;
+            root.CalculateLayout();
+
+            Assert.AreEqual(0f, root.LayoutX);
+            Assert.AreEqual(0f, root.LayoutY);
+            Assert.AreEqual(100f, root.LayoutWidth);
+            Assert.AreEqual(200f, root.LayoutHeight);
+
+            Assert.AreEqual(0f, root_child0.LayoutX);
+            Assert.AreEqual(0f, root_child0.LayoutY);
+            Assert.AreEqual(100f, root_child0.LayoutWidth);
+            Assert.AreEqual(100f, root_child0.LayoutHeight);
+
+            Assert.AreEqual(0f, root_child0_child0.LayoutX);
+            Assert.AreEqual(0f, root_child0_child0.LayoutY);
+            Assert.AreEqual(100f, root_child0_child0.LayoutWidth);
+            Assert.AreEqual(100f, root_child0_child0.LayoutHeight);
+
+            Assert.AreEqual(0f, root_child0_child0_child0.LayoutX);
+            Assert.AreEqual(0f, root_child0_child0_child0.LayoutY);
+            Assert.AreEqual(100f, root_child0_child0_child0.LayoutWidth);
+            Assert.AreEqual(100f, root_child0_child0_child0.LayoutHeight);
+
+            Assert.AreEqual(0f, root_child1.LayoutX);
+            Assert.AreEqual(100f, root_child1.LayoutY);
+            Assert.AreEqual(100f, root_child1.LayoutWidth);
+            Assert.AreEqual(100f, root_child1.LayoutHeight);
+        }
+
+        [Test]
+        public void Test_flex_wrap_align_stretch_fits_one_row()
+        {
+            YogaNode root = new YogaNode();
+            root.FlexDirection = YogaFlexDirection.Row;
+            root.Wrap = YogaWrap.Wrap;
+            root.Width = 150;
+            root.Height = 100;
+
+            YogaNode root_child0 = new YogaNode();
+            root_child0.Width = 50;
+            root.Insert(0, root_child0);
+
+            YogaNode root_child1 = new YogaNode();
+            root_child1.Width = 50;
+            root.Insert(1, root_child1);
+            root.StyleDirection = YogaDirection.LTR;
+            root.CalculateLayout();
+
+            Assert.AreEqual(0f, root.LayoutX);
+            Assert.AreEqual(0f, root.LayoutY);
+            Assert.AreEqual(150f, root.LayoutWidth);
+            Assert.AreEqual(100f, root.LayoutHeight);
+
+            Assert.AreEqual(0f, root_child0.LayoutX);
+            Assert.AreEqual(0f, root_child0.LayoutY);
+            Assert.AreEqual(50f, root_child0.LayoutWidth);
+            Assert.AreEqual(100f, root_child0.LayoutHeight);
+
+            Assert.AreEqual(50f, root_child1.LayoutX);
+            Assert.AreEqual(0f, root_child1.LayoutY);
+            Assert.AreEqual(50f, root_child1.LayoutWidth);
+            Assert.AreEqual(100f, root_child1.LayoutHeight);
+
+            root.StyleDirection = YogaDirection.RTL;
+            root.CalculateLayout();
+
+            Assert.AreEqual(0f, root.LayoutX);
+            Assert.AreEqual(0f, root.LayoutY);
+            Assert.AreEqual(150f, root.LayoutWidth);
+            Assert.AreEqual(100f, root.LayoutHeight);
+
+            Assert.AreEqual(100f, root_child0.LayoutX);
+            Assert.AreEqual(0f, root_child0.LayoutY);
+            Assert.AreEqual(50f, root_child0.LayoutWidth);
+            Assert.AreEqual(100f, root_child0.LayoutHeight);
+
+            Assert.AreEqual(50f, root_child1.LayoutX);
+            Assert.AreEqual(0f, root_child1.LayoutY);
+            Assert.AreEqual(50f, root_child1.LayoutWidth);
+            Assert.AreEqual(100f, root_child1.LayoutHeight);
+        }
+
     }
 }