[vim/vim] Old semi-transparent popup window remains when its text and position are changed on terminal window (Issue #20679)

[mityu]

mityu created an issue (vim/vim#20679)

Steps to reproduce

1. Make this vimrc.vim.

   set nocompatible
   
   function s:timer_callback(popupid) abort
     call popup_settext(a:popupid, 'XYZ')
     call popup_setoptions(a:popupid, #{ col: popup_getpos(a:popupid).col + 3 })
   endfunction
   
   function s:repro() abort
     terminal ++curwin
   
     " Maybe this is an timing issue.  Rarely this bug doesn't happen without
     " this.
     " Probably... we have to wait until the invoked shell fully starts up; i.e.
     " we should wait for the state that Vim has no more need to redraw the
     " terminal window...
     sleep 100m
   
     let popupid = popup_create('ABC', #{ opacity: 30 })
     call timer_start(100, {-> s:timer_callback(popupid)})
   endfunction
   
   command! Repro call s:repro()

2. Open Vim with this command: vim -u /path/to/vimrc.vim

3. Type :Repro<CR> to run the :Repro command.

4. Check the screen.

Expected behaviour

Only the popup area "XYZ" should be remain and the area "ABC" should be cleared.

• Expected behavior
  (Please ignore the difference of popup window's color. It seems that this bug doesn't happen when popup windows are not transparent, so I made popup's opacity to 100 to take this screenshot.)

Screenshot_2026-07-01_00-42-42.png (view on web)

• Actual behavior

Screenshot_2026-07-01_00-30-27.png (view on web)

Version of Vim

Vim 9.1.0752

Environment

OS: NixOS

$ nix-info -m
 - system: `"x86_64-linux"`
 - host os: `Linux 6.18.37, NixOS, 26.11 (Zokor), 26.11.20260629.7a1a647`
 - multi-user?: `yes`
 - sandbox: `yes`
 - version: `nix-env (Nix) 2.34.7`
 - channels(root): `"nixos-25.11"`
 - nixpkgs: `/nix/store/5h5kl81y2l0sgy331sfdqqq2bwnw867w-source`

Terminal:

• WezTerm: wezterm 0-unstable-2026-06-22
• Ghostty: Ghostty 1.3.1
• XTerm: XTerm(410)

Shell:

• bash: GNU bash, version 5.3.9(1)-release (x86_64-pc-linux-gnu)
• fish: fish, version 4.8.0

Logs and stack traces

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[mityu]

mityu left a comment (vim/vim#20679)

I also have a screen cast of my reproduce steps.

https://github.com/user-attachments/assets/84b4ba32-c915-404e-98c4-4e96d05c9a62

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