Fix the white line flashing on top of iTerm2 in fullscreen

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In dark mode, seems it does not happen, but yesterday I changed back to light mode, it started. I remember there is a discussion about this , so here is a note:

Screenshot 2021-02-26 at 8.48.29.png

Turn on Prefs > Advanced > Work around Big Sur bug where a white line flashes at the top of the screen in full screen mode and then restart the app.

Hope it helps.

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