[vim/vim] Fix leftover cells when an opacity popup is resized or closed (PR #20471)

[mattn]

Background redraws under an opacity popup update ScreenLines[] but suppress terminal output, so the terminal no longer matches ScreenLines[] for those cells. Later draws skipped them as "unchanged", leaving parts of the old popup on screen after popup_settext() or popup_clear(). Track suppressed cells and force their next output. Added a screendump test.

Fixes #20459

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You can view, comment on, or merge this pull request online at:

  https://github.com/vim/vim/pull/20471

Commit Summary

• 11f792a Fix leftover cells when an opacity popup is resized or closed

File Changes

(5 files)

• M src/screen.c (125)
• A src/testdir/dumps/Test_popupwin_opacity_settext_1.dump (12)
• A src/testdir/dumps/Test_popupwin_opacity_settext_2.dump (12)
• A src/testdir/dumps/Test_popupwin_opacity_settext_3.dump (12)
• M src/testdir/test_popupwin.vim (28)

Patch Links:

• https://github.com/vim/vim/pull/20471.patch
• https://github.com/vim/vim/pull/20471.diff

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