Fix min constraint incorrectly reducing available space

Summary:
If a min constraint exists. It incorrectly reduces the available space by that amount. This adds a test and fix for this.
Closes https://github.com/facebook/yoga/pull/501

Differential Revision: D4867146

Pulled By: emilsjolander

fbshipit-source-id: ceafe070bfe7f501929d316656ac44c4e1753059

csharp/tests/Facebook.Yoga/YGMinMaxDimensionTest.cs

@@ -957,5 +957,113 @@ namespace Facebook.Yoga
             Assert.AreEqual(10f, root_child0.LayoutHeight);
         }
 
+        [Test]
+        public void Test_min_width_in_flex_distribution()
+        {
+            YogaConfig config = new YogaConfig();
+
+            YogaNode root = new YogaNode(config);
+            root.FlexDirection = YogaFlexDirection.Row;
+            root.Width = 300;
+            root.Height = 300;
+
+            YogaNode root_child0 = new YogaNode(config);
+            root_child0.FlexGrow = 2;
+            root_child0.FlexShrink = 1;
+            root_child0.FlexBasis = 0.Percent();
+            root_child0.MinWidth = 100;
+            root_child0.MaxWidth = 200;
+            root.Insert(0, root_child0);
+
+            YogaNode root_child1 = new YogaNode(config);
+            root_child1.FlexGrow = 1;
+            root_child1.FlexShrink = 1;
+            root_child1.FlexBasis = 0.Percent();
+            root.Insert(1, root_child1);
+
+            YogaNode root_child2 = new YogaNode(config);
+            root_child2.FlexGrow = 1;
+            root_child2.FlexShrink = 1;
+            root_child2.FlexBasis = 0.Percent();
+            root.Insert(2, root_child2);
+
+            YogaNode root_child3 = new YogaNode(config);
+            root_child3.FlexGrow = 1;
+            root_child3.FlexShrink = 1;
+            root_child3.FlexBasis = 0.Percent();
+            root.Insert(3, root_child3);
+
+            YogaNode root_child4 = new YogaNode(config);
+            root_child4.FlexGrow = 1;
+            root_child4.FlexShrink = 1;
+            root_child4.FlexBasis = 0.Percent();
+            root.Insert(4, root_child4);
+            root.StyleDirection = YogaDirection.LTR;
+            root.CalculateLayout();
+
+            Assert.AreEqual(0f, root.LayoutX);
+            Assert.AreEqual(0f, root.LayoutY);
+            Assert.AreEqual(300f, root.LayoutWidth);
+            Assert.AreEqual(300f, root.LayoutHeight);
+
+            Assert.AreEqual(0f, root_child0.LayoutX);
+            Assert.AreEqual(0f, root_child0.LayoutY);
+            Assert.AreEqual(100f, root_child0.LayoutWidth);
+            Assert.AreEqual(300f, root_child0.LayoutHeight);
+
+            Assert.AreEqual(100f, root_child1.LayoutX);
+            Assert.AreEqual(0f, root_child1.LayoutY);
+            Assert.AreEqual(50f, root_child1.LayoutWidth);
+            Assert.AreEqual(300f, root_child1.LayoutHeight);
+
+            Assert.AreEqual(150f, root_child2.LayoutX);
+            Assert.AreEqual(0f, root_child2.LayoutY);
+            Assert.AreEqual(50f, root_child2.LayoutWidth);
+            Assert.AreEqual(300f, root_child2.LayoutHeight);
+
+            Assert.AreEqual(200f, root_child3.LayoutX);
+            Assert.AreEqual(0f, root_child3.LayoutY);
+            Assert.AreEqual(50f, root_child3.LayoutWidth);
+            Assert.AreEqual(300f, root_child3.LayoutHeight);
+
+            Assert.AreEqual(250f, root_child4.LayoutX);
+            Assert.AreEqual(0f, root_child4.LayoutY);
+            Assert.AreEqual(50f, root_child4.LayoutWidth);
+            Assert.AreEqual(300f, root_child4.LayoutHeight);
+
+            root.StyleDirection = YogaDirection.RTL;
+            root.CalculateLayout();
+
+            Assert.AreEqual(0f, root.LayoutX);
+            Assert.AreEqual(0f, root.LayoutY);
+            Assert.AreEqual(300f, root.LayoutWidth);
+            Assert.AreEqual(300f, root.LayoutHeight);
+
+            Assert.AreEqual(200f, root_child0.LayoutX);
+            Assert.AreEqual(0f, root_child0.LayoutY);
+            Assert.AreEqual(100f, root_child0.LayoutWidth);
+            Assert.AreEqual(300f, root_child0.LayoutHeight);
+
+            Assert.AreEqual(150f, root_child1.LayoutX);
+            Assert.AreEqual(0f, root_child1.LayoutY);
+            Assert.AreEqual(50f, root_child1.LayoutWidth);
+            Assert.AreEqual(300f, root_child1.LayoutHeight);
+
+            Assert.AreEqual(100f, root_child2.LayoutX);
+            Assert.AreEqual(0f, root_child2.LayoutY);
+            Assert.AreEqual(50f, root_child2.LayoutWidth);
+            Assert.AreEqual(300f, root_child2.LayoutHeight);
+
+            Assert.AreEqual(50f, root_child3.LayoutX);
+            Assert.AreEqual(0f, root_child3.LayoutY);
+            Assert.AreEqual(50f, root_child3.LayoutWidth);
+            Assert.AreEqual(300f, root_child3.LayoutHeight);
+
+            Assert.AreEqual(0f, root_child4.LayoutX);
+            Assert.AreEqual(0f, root_child4.LayoutY);
+            Assert.AreEqual(50f, root_child4.LayoutWidth);
+            Assert.AreEqual(300f, root_child4.LayoutHeight);
+        }
+
     }
 }