AsyncUpdater: Cancel updates in derived class destructors

modules/juce_events/broadcasters/juce_ChangeBroadcaster.h

@@ -86,6 +86,7 @@ private:
     {
     public:
         ChangeBroadcasterCallback();
+        ~ChangeBroadcasterCallback() override { cancelPendingUpdate(); }
         void handleAsyncUpdate() override;
 
         ChangeBroadcaster* owner;

modules/juce_events/timers/juce_Timer.cpp

@@ -38,6 +38,7 @@ public:
 
     ~TimerThread() override
     {
+        cancelPendingUpdate();
         signalThreadShouldExit();
         callbackArrived.signal();
         stopThread (4000);