[fix] ResponderEventPlugin event filtering

Exclude middle, wheel, and right click mouse events from the responder
system. This fixes the Touchables incorrectly triggering 'onPress' in
response to these events.

Filter mousemove events in the 'extractEvents' methods, and check for
active touches rather than the length of the touch bank. This fixes the
PanResponder not functioning after the first touch in Firefox.

Fix #719
Fix #729
Close #804

Author: necolas

Diff for: packages/react-native-web/src/modules/injectResponderEventPlugin/index.js

@@ -39,16 +39,26 @@ ResponderEventPlugin.eventTypes.selectionChangeShouldSetResponder.dependencies =
 ResponderEventPlugin.eventTypes.scrollShouldSetResponder.dependencies = [topScroll];
 ResponderEventPlugin.eventTypes.startShouldSetResponder.dependencies = startDependencies;
 
-const originalRecordTouchTrack = ResponderTouchHistoryStore.recordTouchTrack;
-
-ResponderTouchHistoryStore.recordTouchTrack = (topLevelType, nativeEvent) => {
-  // Filter out mouse-move events when the mouse button is not down
-  if (topLevelType === topMouseMove && !ResponderTouchHistoryStore.touchHistory.touchBank.length) {
+const originalExtractEvents = ResponderEventPlugin.extractEvents;
+ResponderEventPlugin.extractEvents = (topLevelType, targetInst, nativeEvent, nativeEventTarget) => {
+  const hasActiveTouches = ResponderTouchHistoryStore.touchHistory.numberActiveTouches > 0;
+  if (
+    // Filter out mousemove events when there hasn't been a touch yet
+    (topLevelType === topMouseMove && !hasActiveTouches) ||
+    // Filter out events from wheel/middle and right click.
+    (nativeEvent.button === 1 || nativeEvent.button === 2)
+  ) {
     return;
   }
 
   const normalizedEvent = normalizeNativeEvent(nativeEvent);
-  originalRecordTouchTrack.call(ResponderTouchHistoryStore, topLevelType, normalizedEvent);
+  return originalExtractEvents.call(
+    ResponderEventPlugin,
+    topLevelType,
+    targetInst,
+    normalizedEvent,
+    nativeEventTarget
+  );
 };
 
 EventPluginHub.injection.injectEventPluginsByName({