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bug#42406: Mouse-wheel scrolling can be flickering

From: martin rudalics
Subject: bug#42406: Mouse-wheel scrolling can be flickering
Date: Fri, 18 Dec 2020 00:19:29 +0100 
>     if (WINDOWP (fselected_window) && XWINDOW (fselected_window) == w)
> -    update_mode_lines = 42;
> +    {
> +      update_mode_lines = 2;
> +      fset_redisplay (XFRAME (WINDOW_FRAME (w)));
> +    }
>     else
>       w->update_mode_line = true;

Why penalize people with >= 2 windows per selected frame when scrolling
one of them by updating all the others' mode, header, tab lines?

martin
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