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

Comienza en src/MacVim/MMBackend.m e inspecciona el cambio que añade [self processInputQueue] después de CFRunLoopRunInMode. Reproduce los artefactos de resaltado y desplazamiento durante el inicio con la configuración de gvimrc indicada en macOS y compara el comportamiento con esa línea revertida. Se considera terminado cuando la regresión esté aislada y el comportamiento adecuado esté cubierto por el proceso de verificación disponible del proyecto.