[vim/vim] Some way to prevent cursor flickering (Issue #11918)
monkoose
TL;DR some plugins which do some computation + redrawing causing cursor to flicker
I'm using a combination of pretty popular plugins: ALE + CoC which have some autocmds on CursorHold, InsertLeave etc, which process some lsp/linting behind the scenes. They are working fine, but also are a cause of the cursor flickering (starting visible in some big files 1000+ lines) as shown in the screencast above.
This behavior can be replicated with something like this
vim9script def HeavyComputation(_): number var sum = 0 redraw for _ in range(200000) # adjust loop size if flickering still not visible on your machine or you can set it very big to completely hide the cursor for the time of computation sum += 2 endfor return sum enddef augroup HelloOpana autocmd! autocmd CursorHold * timer_start(1, HeavyComputation) autocmd CursorHold * timer_start(20, HeavyComputation) autocmd CursorHold * timer_start(40, HeavyComputation) augroup END defcompile
My assumption this is happening when redraw follows some heavy computation. If we remove redraw from this code then flickering is gone. Is there a reason for such behavior that cursor is hidden until this computation happens? Can it be prevented somehow?
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Bram Moolenaar
> TL;DR some plugins which do some computation + redrawing causing
> cursor to flicker
>
>
> I'm using a combination of pretty popular plugins:
> [CoC](https://github.com/neoclide/coc.nvim) which have some autocmds
> on CursorHold, InsertLeave etc, which process some lsp/linting behind
> the scenes. They are working fine, but also are a cause of the cursor
> flickering (starting visible in some big files 1000+ lines) as shown
> in the screencast above.
>
> This behavior can be replicated with something like this
Vim will hide the cursor while updating the screen. This avoids the
cursor flashing around while drawing text.
The cursor is enabled again before Vim starts waiting for the user to
type something. In your example the HeavyComputation() is causing some
time to pass before this, hence the noticeable flicker.
There is a trick you could try: After the :redraw command, use a :sleep
command with a very short time. Thus:
:redraw
:sleep 1m
For me this removes the flicker.
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monkoose
Closed #11918 as completed.
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