Seletskiy wrote:
> Such dummy sign is useful to keep SignColumn shown everytime and
> prevent it's collapsing on sign update. This solution will prevent
> "flickering" caused by such collapsing.
>
> When using `relativenumber` window redraw becomes very unstable when
> signs are placed and unplaced, often cause whole window not only to
> redraw, but to clear screen first, which ends up by constant screen
> flickering.
>
> I've found that even placing invisible dummy sign (especially on line
> 1) will cause entire window to clear, which I've found as
> unacceptable.
>
> Proposed patch will prevent redrawing when sign without text or image
> was placed.
>
> However, I've found that using `relativenumber` cause to clearing
> whole screen more often. Even in cases where clearing entire screen is
> not needed. It is very reproducible using YouCompleteMe plugin (now it
> has not-so-great workaround which eliminates _all_ signs in
> SignColumn). So, I think there must be more clever way to determine
> when screen should be cleared when `relativenumber` is used. I'm glad
> to help if I've got some clues about how to do it and not break
> everything.
So you place an invisible sign to keep the sign column there, and avoid
placing that to cause a redraw. But then when you actually place signs
or move them around, don't you get a similar redraw? Thus this change
would only help for rare situtations. A better solution would be to
optimize redrawing when placing/unplacing a sign.
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