[vim/vim] setting opacity in popup with a terminal freeze vim (Issue #20214)

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Shad

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May 13, 2026, 5:48:47 PM (2 days ago) May 13

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shadowwa created an issue (vim/vim#20214)

Steps to reproduce

create a file

vim --clean testpopup.vim

let opt = {
            \ 'hidden': 1,
            \ 'term_finish': 'close',
            \ }
let bufnr = term_start(['/bin/bash'], opt)
let opts = {
            \ 'title': 'term in popup',
            \ 'border': [1, 1, 1, 1],
            \ 'opacity': 10,
            \ }
let winid = popup_create(bufnr, opts)

source it

:source %

try to type something, if you are fast enough you will see the first character drawn then nothing else and unable to switch mode or type something else.

Omitting the opacity option or setting it to 100 allow the expected behaviour.

Additional information:
If I don't use --clean to use my .vimrc that set some Pmenu* highlight, I can sometime see the border flickering at the bottom right of the popup when vim is not responding.
the border switch between

╔term in popup═══════╗
║                    ║
║                    ║
╚════════════════════╝

and

╔term in popup═══════╗
║                    ║
║                    ║
╚═════════════════════

Expected behaviour

Open a popup that allow to type into the terminal without freezing.

Version of Vim

vim 9.2.0437

Environment

Operating system: mageia cauldron
Terminal: Konsole
Value of $TERM: konsole-256color
Shell: bash-5.3

also reproduced with gvim 9.2.0437 from my distribution and the latest Vim-v9.2.0478.glibc2.34-x86_64.AppImage

Logs and stack traces

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Christian Brabandt

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11:08 AM (2 hours ago) 11:08 AM

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Closed #20214 as completed via f281493.

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