WM/window: don't manage 1x1 pixel windows.

Author: trunkmaster

Applications/Workspace/WM/window.c

@@ -754,6 +754,14 @@ WWindow *wManageWindow(WScreen *scr, Window window)
   /* get geometry stuff */
   wClientGetNormalHints(wwin, &wattribs, True, &x, &y, &width, &height);
 
+  /* Some applications create placeholder windows with 1x1 size (e.g. VirtualBox internal windows).
+     Don't manage those initial 1x1 windows. */
+  if (width <= 1 && height <= 1 && !wwin->flags.is_dockapp) {
+    wWindowDestroy(wwin);
+    XUngrabServer(dpy);
+    return NULL;
+  }
+
   /* get colormap windows */
   GetColormapWindows(wwin);