Fabric: Make views with accessibilityElementsHidden form stacking c…

…ontext

Summary:
`accessibilityElementsHidden` property hides a subtree starting from the node with this prop from VoiceOver and TalkBack, so the node with this prop should form the stacking context (otherwise the children will mount as siblings and the property will not have an effect).

Changelog: [Internal] Fabric-specific internal change.

Reviewed By: JoshuaGross

Differential Revision: D23202220

fbshipit-source-id: d87dfab5f791219551c1eb90cdf3b3fa86f9c51f

ReactCommon/react/renderer/components/view/ViewShadowNode.cpp

@@ -49,6 +49,7 @@ void ViewShadowNode::initialize() noexcept {
       viewProps.yogaStyle.display() == YGDisplayNone ||
       viewProps.getClipsContentToBounds() ||
       isColorMeaningful(viewProps.shadowColor) ||
+      viewProps.accessibilityElementsHidden ||
       viewProps.importantForAccessibility != ImportantForAccessibility::Auto;
 
   bool formsView = isColorMeaningful(viewProps.backgroundColor) ||