Fix triangle views on iOS (#23402)

Summary:
Fixes #22824 #21945 , the bug comes from #21208 , it was to fix #11897. Now Let's constrain edge adjust only when view has corners.

[iOS] [Fixed] - Fix triangle views on iOS
Pull Request resolved: #23402

Differential Revision: D14059192

Pulled By: hramos

fbshipit-source-id: be613bf056d3cc484f281f7ea3d08f251971700a

React/Views/RCTBorderDrawing.m

@@ -224,13 +224,15 @@ static CGContextRef RCTUIGraphicsBeginImageContext(CGSize size, CGColorRef backg
     borderInsets.right + MAX(cornerInsets.bottomRight.width, cornerInsets.topRight.width)
   };
 
-  // Asymmetrical edgeInsets cause strange artifacting on iOS 10 and earlier.
-  edgeInsets = (UIEdgeInsets){
-    MAX(edgeInsets.top, edgeInsets.bottom),
-    MAX(edgeInsets.left, edgeInsets.right),
-    MAX(edgeInsets.top, edgeInsets.bottom),
-    MAX(edgeInsets.left, edgeInsets.right),
-  };
+  if (hasCornerRadii) {
+    // Asymmetrical edgeInsets cause strange artifacting on iOS 10 and earlier.
+    edgeInsets = (UIEdgeInsets){
+      MAX(edgeInsets.top, edgeInsets.bottom),
+      MAX(edgeInsets.left, edgeInsets.right),
+      MAX(edgeInsets.top, edgeInsets.bottom),
+      MAX(edgeInsets.left, edgeInsets.right),
+    };
+  }
 
   const CGSize size = makeStretchable ? (CGSize){
     // 1pt for the middle stretchable area along each axis