[vim/vim] GTK3(wl): fix mouse selection redraw in cmdline (PR #20971)

Modeless mouse selection on Wayland may not redraw while Vim is
waiting for input, causing the selection highlight to lag behind
mouse movement.

Flush pending GUI updates while a modeless selection is in progress.

* X11 was not affected.
* Tested FEAT_TINY, 'clipboard', 'mouse' settings.

Closes: #20969

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

  https://github.com/vim/vim/pull/20971

-- Commit Summary --

  * GTK3(wl): fix mouse selection redraw in cmdline

-- File Changes --

    M src/gui_gtk_x11.c (6)

-- Patch Links --

https://github.com/vim/vim/pull/20971.patch
https://github.com/vim/vim/pull/20971.diff

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