Fix justify content + min dimension usage in root

Reviewed By: gkassabli, lucasr

Differential Revision: D4021443

fbshipit-source-id: 00f58c6078ac3076221e1148aacc34712786deb5

React/CSSLayout/CSSLayout.c

@@ -1514,10 +1514,14 @@ static void layoutNodeImpl(const CSSNodeRef node,
     // that are aligned "stretch". We need to compute these stretch values and
     // set the final positions.
 
-    // If we are using "at most" rules in the main axis, we won't distribute
-    // any remaining space at this point.
+    // If we are using "at most" rules in the main axis. Calculate the remaining space when
+    // constraint by the min size defined for the main axis.
     if (measureModeMainDim == CSSMeasureModeAtMost) {
-      remainingFreeSpace = 0;
+      if (!CSSValueIsUndefined(node->style.minDimensions[dim[mainAxis]]) && node->style.minDimensions[dim[mainAxis]] >= 0) {
+        remainingFreeSpace = fmaxf(0, node->style.minDimensions[dim[mainAxis]] - (availableInnerMainDim - remainingFreeSpace));
+      } else {
+        remainingFreeSpace = 0;
+      }
     }
 
     switch (justifyContent) {