try harder to prevent the race causing a "Warning: Source ID XXXXXX w…

…as not found when attempting to remove it self.source_remove(rt)": move the logging after the call

git-svn-id: https://xpra.org/svn/Xpra/trunk@11600 3bb7dfac-3a0b-4e04-842a-767bc560f471

src/xpra/server/window/video_subregion.py

@@ -74,11 +74,11 @@ def set_auto_refresh_delay(self, d):
 
     def cancel_refresh_timer(self):
         rt = self.refresh_timer
-        refreshlog("cancel_refresh_timer() timer=%s", rt)
         if rt:
             self.source_remove(rt)
             self.refresh_timer = None
             self.refresh_regions = []
+        refreshlog("cancel_refresh_timer() timer=%s", rt)
 
     def get_info(self):
         r = self.rectangle