[vim/vim] GTK4: fix shell resize and font-change redraw (PR #20317)

[mattn]

GTK4 builds did not honor set lines=... / set columns=... after the window was realized, and font changes left the editor blank until forced refresh.

Two related issues in src/gui_gtk4.c:

1. gui_mch_set_shellsize() only called gtk_window_set_default_size(). In GTK4 that mostly affects the initial show; once realized, window managers such as xfwm4 on X11 ignore further updates because gui.drawarea has no natural size to drive a grow. Push the requested size with a temporary gtk_widget_set_size_request() on the drawing area, then clear it on idle so the user can still shrink the window manually.

2. After the drawing area is resized, drawarea_resize_cb() destroys and recreates the backing cairo surface filled with the background color. The follow-up gui_resize_shell() skips shell_resized() when Rows/Columns are unchanged (typical for font changes that keep the same cell count), so the fresh surface stayed blank. Set gui.force_redraw before calling gui_resize_shell() to guarantee a full redraw.

Fixes #20307

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

  https://github.com/vim/vim/pull/20317

Commit Summary

• 2137781 GTK4: shell resize and font change leave the window blank or wrong size

File Changes

(1 file)

• M src/gui_gtk4.c (36)

Patch Links:

• https://github.com/vim/vim/pull/20317.patch
• https://github.com/vim/vim/pull/20317.diff

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