Fix a bug where fullscreen setting could be auto-repeated

This seems to be because on OSX entering or exiting fullscreen
interrupts keyboard input so we never get the release signal.

The solution here was to cancel any auto-repeat right before
we issue the fullscreen command. This was a better solution than
the additional delay I added first (which also happened to fix
the issue but was most likely prone to races).

Fixes plexinc/plex-media-player-private#489

src/input/InputComponent.cpp

@@ -273,3 +273,9 @@ void InputComponent::registerHostCommand(const QString& command, std::function<v
   QLOG_DEBUG() << "Adding host command:" << qPrintable(command) << "mapped to anonymous function";
   m_hostCommands.insert(command, recvSlot);
 }
+
+/////////////////////////////////////////////////////////////////////////////////////////
+void InputComponent::cancelAutoRepeat()
+{
+  m_autoRepeatTimer->stop();
+}

src/input/InputComponent.h

@@ -104,6 +104,7 @@ public:
   // to hostInput(). The actions parameter contains a list of actions which
   // should be actually dispatched.
   Q_INVOKABLE void executeActions(const QStringList& actions);
+  void cancelAutoRepeat();
 
 signals:
   // Always emitted when any input arrives

src/ui/KonvergoWindow.cpp

@@ -245,6 +245,8 @@ void KonvergoWindow::updateMainSectionSettings(const QVariantMap& values)
   if (values.find("fullscreen") == values.end())
     return;
 
+  InputComponent::Get().cancelAutoRepeat();
+
   updateFullscreenState();
 }