am 120a4594: Drop all dispatcher state when dispatcher is disabled.

include/ui/InputDispatcher.h

@@ -1032,6 +1032,9 @@ private:
     // Splitting motion events across windows.
     MotionEntry* splitMotionEvent(const MotionEntry* originalMotionEntry, BitSet32 pointerIds);
 
+    // Reset and drop everything the dispatcher is doing.
+    void resetAndDropEverythingLocked(const char* reason);
+
     // Dump state.
     void dumpDispatchStateLocked(String8& dump);
     void logDispatchStateLocked();

libs/ui/InputDispatcher.cpp

@@ -1302,6 +1302,9 @@ Failed:
     }
 
 Unresponsive:
+    // Reset temporary touch state to ensure we release unnecessary references to input channels.
+    mTempTouchState.reset();
+
     nsecs_t timeSpentWaitingForApplication = getTimeSpentWaitingForApplicationLocked(currentTime);
     updateDispatchStatisticsLocked(currentTime, entry,
             injectionResult, timeSpentWaitingForApplication);
@@ -2590,6 +2593,10 @@ void InputDispatcher::setInputDispatchMode(bool enabled, bool frozen) {
                 resetANRTimeoutsLocked();
             }
 
+            if (mDispatchEnabled && !enabled) {
+                resetAndDropEverythingLocked("dispatcher is being disabled");
+            }
+
             mDispatchEnabled = enabled;
             mDispatchFrozen = frozen;
             changed = true;
@@ -2608,6 +2615,21 @@ void InputDispatcher::setInputDispatchMode(bool enabled, bool frozen) {
     }
 }
 
+void InputDispatcher::resetAndDropEverythingLocked(const char* reason) {
+#if DEBUG_FOCUS
+    LOGD("Resetting and dropping all events (%s).", reason);
+#endif
+
+    synthesizeCancelationEventsForAllConnectionsLocked(InputState::CANCEL_ALL_EVENTS, reason);
+
+    resetKeyRepeatLocked();
+    releasePendingEventLocked();
+    drainInboundQueueLocked();
+    resetTargetsLocked();
+
+    mTouchState.reset();
+}
+
 void InputDispatcher::logDispatchStateLocked() {
     String8 dump;
     dumpDispatchStateLocked(dump);