Issues after last commit to src/MacVim/MMBackend.m

Describe the bug
I have several issues with the current master:

VIM - Vi IMproved 8.2 (2019 Dec 12, compiled May 30 2020 15:13:09)
macOS version
Included patches: 1-830

At startup, at least some of the highlight commands from gvimrc are not executed. For example, I have:

set cursorline
set cursorlineopt=screenline
hi CursorLine	NONE
hi CursorLine	gui=underline	guisp=gray

but do not get a underline. Furthermore I sometimes see artifacts of my status bar while scrolling.

I suspect the latest changes in src/MacVim/MMBackend.m as the reason for this behaviour. If I revert this part of the commit:

         while (CFRunLoopRunInMode(kCFRunLoopDefaultMode, 0, true)
                   == kCFRunLoopRunHandledSource)
              ;   // do nothing
+       [self processInputQueue];
  }
  - (void)flushQueue:(BOOL)force

I can no longer reproduce the issues and MacVIM behaves as before.

Can someone please check whether the [self processInputQueue]; is necessary at this point or whether it can cause such problems?

Environment (please complete the following information):

• VIM - Vi IMproved 8.2 (2019 Dec 12, compiled May 30 2020 15:13:09), Included patches: 1-830
• OS: macOS 10.15.5
• GUI: MacVIM

src/MacVim/MMBackend.m から始め、CFRunLoopRunInMode の後に [self processInputQueue] を追加する変更を調べます。macOS で報告された gvimrc 設定を使って、起動時のハイライトとスクロールのアーティファクトを再現し、その行を元に戻した場合の動作と比較します。回帰が切り分けられ、適切な動作がプロジェクトで利用可能な検証プロセスによってカバーされれば完了です。