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dd306bd48a
Problem: When the popup menu (PUM) occupies more than half the screen
height, it flickers whenever a character is typed or erased.
This happens because the PUM is cleared and the screen is
redrawn before a new PUM is rendered. The extra redraw between
menu updates causes visible flicker.
Solution: A complete, non-hacky fix would require removing the
CmdlineChanged event from the loop and letting autocompletion
manage the process end-to-end. This is because screen redraws
after any cmdline change are necessary for other features to
work.
This change modifies wildtrigger() so that the next typed
character defers the screen update instead of redrawing
immediately. This removes the intermediate redraw, eliminating
flicker and making cmdline autocompletion feel smooth
(Girish Palya).
Trade-offs:
This behavior change in wildtrigger() is tailored specifically for
:h cmdline-autocompletion. wildtrigger() now has no general-purpose use
outside this scenario.
closes: vim/vim#17932
da9c966893
Use pum_check_clear() instead of update_screen().
Cherry-pick Test_wildtrigger_update_screen() change from patch 9.1.1682.
Co-authored-by: Girish Palya <girishji@gmail.com>