[vim/vim] completion info popup cannot be scrolled with the keyboard (PR #20444)

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h_east

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Jun 7, 2026, 4:31:39 PM (2 days ago) Jun 7

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Problem:  The info popup shown beside the insert-mode and command-line
          completion menu can only be scrolled with the mouse wheel, so
          the part below the visible area is unreachable when working
          from the keyboard.
Solution: While the completion menu is shown, scroll the info popup with
          CTRL-SHIFT-Up/Down (one line), CTRL-SHIFT-PageUp/PageDown (one
          page) and CTRL-SHIFT-N/CTRL-SHIFT-P (one line).  The menu stays
          open and the selected item does not change.

fixes: #20441

Note: behavior change

While the completion menu is shown, CTRL-SHIFT-<Up>/<Down>/<PageUp>/<PageDown>
and CTRL-SHIFT-N/P previously navigated the menu (the modifier SHIFT was ignored).
This patch repurposes them, in both Insert and Command-line completion, to
scroll the info popup instead. The plain keys still navigate the menu, and
these CTRL-SHIFT variants only duplicated that navigation before. This is a
behavior change, but we believe it is not a problem.

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

https://github.com/vim/vim/pull/20444

Commit Summary

dbe5fa8 completion info popup cannot be scrolled with the keyboard

File Changes

(9 files)

Patch Links:

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Christian Brabandt

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Jun 8, 2026, 4:36:31 PM (8 hours ago) Jun 8

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chrisbra left a comment (vim/vim#20444)

While the completion menu is shown, CTRL-SHIFT-///

and CTRL-SHIFT-N/P previously navigated the menu (the modifier SHIFT was ignored).
This patch repurposes them, in both Insert and Command-line completion, to
scroll the info popup instead. The plain keys still navigate the menu, and
these CTRL-SHIFT variants only duplicated that navigation before. This is a
behavior change, but we believe it is not a problem.

I am a little worried of using those keys as I think those are not generally available in a plain old terminal (e.g. linux console). We could use Ctrl-F/Ctrl-B for pagewise down/up scrolling, unfortunately Ctrl-E/Y are already taken otherwise I'd suggest those for linewise scrolling. incsearch uses Ctrl-G/Ctrl-T to move down/up so perhaps we can use those for completion mode linewise scrolling?