[client] x11: process clipboard events early

Due to the logic in the event loop property events may get filtered out
that were clipboard related. This changes ensures the clipboard event
handler code gets to run first avoiding this issue.

client/displayservers/X11/x11.c

@@ -558,6 +558,10 @@ static int x11EventThread(void * unused)
     XEvent xe;
     XNextEvent(x11.display, &xe);
 
+    // call the clipboard handling code
+    if (x11CBEventThread(xe))
+      continue;
+
     switch(xe.type)
     {
       case ClientMessage:
@@ -666,9 +670,6 @@ static int x11EventThread(void * unused)
         }
         break;
     }
-
-    // call the clipboard handling code
-    x11CBEventThread(xe);
   }
 
   return 0;