XQuartz: Call RRScreenSizeNotify after handling externally-generated XP_EVENT_DISPLAY_CHANGED

We get an XP_EVENT_DISPLAY_CHANGED event when our display configuration is
changed.  If this change was caused by hotplugging a monitor or Mac Display
Preferences changes by the user, we need to call RRScreenSizeNotify in order
to ensure new connections get the correct screen size.

http://xquartz.macosforge.org/trac/ticket/460

Signed-off-by: Jeremy Huddleston <jeremyhu@apple.com>
(cherry picked from commit 418bb57a39)

hw/xquartz/darwinEvents.c

@@ -279,10 +279,9 @@ static void DarwinEventHandler(int screenNum, InternalEvent *ie, DeviceIntPtr de
         case kXquartzDisplayChanged:
             DEBUG_LOG("kXquartzDisplayChanged\n");
             QuartzUpdateScreens();
-#ifdef RANDR
+
             /* Update our RandR info */
             QuartzRandRUpdateFakeModes(TRUE);
-#endif
             break;
             
         default:

hw/xquartz/quartz.c

@@ -244,6 +244,9 @@ void QuartzUpdateScreens(void) {
     DeliverEvents(pRoot, &e, 1, NullWindow);
 
     quartzProcs->UpdateScreen(pScreen);
+
+    /* Tell RandR about the new size, so new connections get the correct info */
+    RRScreenSizeNotify(pScreen);
 }
 
 static void pokeActivityCallback(CFRunLoopTimerRef timer, void *info) {