Pressable: disable click bubbling in Pressable (facebook#37542)

Summary:
Pull Request resolved: facebook#37542

Changelog: [General] [Changed] - Pressable: prevent click bubbling in Pressable

This diff modifies pressability such that `onClick` events for pressables will only result in `onPress` being called when the pressable in question is both the `target` and the `currentTarget` for the event.

This is only really relevant for nested pressables, where `click` received by the inner pressable may bubble up to the parent pressable (this change effectively prevents that from happening). A future change will update the click event on Android to be bubbling (currently its a direct event); this change will reduce the possibility of breakages from that change.

Reviewed By: vincentriemer

Differential Revision: D46081810

fbshipit-source-id: 37423fda03992d48baee04b753d7bb9295a76f9b

Author: Alex Danoff

packages/react-native/Libraries/Pressability/Pressability.js

@@ -553,6 +553,13 @@ export default class Pressability {
           return;
         }
 
+        // for non-pointer click events (e.g. accessibility clicks), we should only dispatch when we're the "real" target
+        // in particular, we shouldn't respond to clicks from nested pressables
+        if (event?.currentTarget !== event?.target) {
+          event?.stopPropagation();
+          return;
+        }
+
         const {onPress, disabled} = this._config;
         if (onPress != null && disabled !== true) {
           onPress(event);