Workaround for #1050

* Revert [MMBackend update]
* Skip RunVim in Test_opt_default_cdpath

src/MacVim/MMBackend.m

@@ -633,7 +633,6 @@ extern GuiFont gui_mch_retain_font(GuiFont font);
     while (CFRunLoopRunInMode(kCFRunLoopDefaultMode, 0, true)
             == kCFRunLoopRunHandledSource)
         ;   // do nothing
-    [self processInputQueue];
 }
 
 - (void)flushQueue:(BOOL UNUSED)force

src/testdir/test_options.vim

@@ -850,10 +850,13 @@ func Test_opt_default_cdpath()
   else
     let $CDPATH='/path/to/dir1;/path/to/dir2'
   endif
+  " Workaround for https://github.com/macvim-dev/macvim/issues/1050
+  if !(has('gui_macvim') && has('gui_running'))
   if RunVim([], after, '')
     call assert_equal([], readfile('Xtestout'))
     call delete('Xtestout')
   endif
+  endif
 endfunc
 
 " Test for setting keycodes using set