[vim/vim] Popup with opacity and border and modified content is not cleared (Issue #20459)

[Nick Jensen]

nickspoons created an issue (vim/vim#20459)

Steps to reproduce

In some circumstances, modifying a popup content results in some parts of the popup not being cleared properly from the screen. It appears to be a combination of an opacity value < 100, no popup highlight, and a border, in combination with a popup_settext() call.

Run following shell command:

cat <<'EOF' > /tmp/popup_err.vim ; vim -Nu NONE -S /tmp/popup_err.vim /tmp/popup_err.vim
vim9script

# leftover elements of the small popup remain here:




#  ^^^

var content_small = [ 'abc', 'ABC', '123', '456' ]
var content_large = [ 'ABCDEFGHIJKLMNOPQRSTUVWXYZ', '', '', '', '', '.' ]

var pwinid = popup_create(content_small, {
  line: 2,
  col: 2,
  border: [],
  highlight: 'None',
  opacity: 50
})

timer_start(1000, (_) => popup_settext(pwinid, content_large))
timer_start(2000, (_) => popup_clear())
EOF

As can be seen in this screenshot, part of the popup remains in the display after the popup has been closed:

image.png (view on web)

Note that the error is not occurring at the popup_clear() call but at the popup_settext() call. After the popup content is modified, the larger popup still contains part of the smaller popup:

image.png (view on web)

Expected behaviour

The popup should be properly cleared.

Version of Vim

9.2.0612

Environment

Linux (Pop_OS! 22.04), multiple terminals

Logs and stack traces

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