Early-out of resize handling if the window has not been presented yet. Fix regression of the bug addressed in commit 40090e.

(cherry picked from commit 347d839688)

src/MacVim/MMWindowController.m

@@ -1023,7 +1023,7 @@
         return;
     }
 
-    if (!setupDone || fullScreenEnabled) return;
+    if (!setupDone || fullScreenEnabled || !windowPresented) return;
 
     // NOTE: Since we have no control over when the window may resize (Cocoa
     // may resize automatically) we simply set the view to fill the entire