[vim/vim] gtk4(font): (PR #21013)

**Problem**:

* Fonts do not account for letter spacing (`:help 'linespace'` is what vim calls it).
* Sign column has seams between lines.

**Solution**:
* Font: Round char with nearest pixel
* Signs: Overlap adjacent row nodes by one pixel.

----

c158acfce39d8afa61f74ffb857dea93a3df3105 round char w nearest px

c158acf Overlap adjacent row nodes by one pixel.

GSK renderer rounding seems to add 1px (not sure).

Possibly related: https://blogs.gnome.org/gtk/2026/05/28/snapping/

Fixes: #21002
You can view, comment on, or merge this pull request online at:

  https://github.com/vim/vim/pull/21013

-- Commit Summary --

  * GTK4(font): round char w nearest px
  * GTK4(font): signcol has seams

-- File Changes --

    M src/gui_gtk4.c (2)
    M src/gui_gtk4_da.c (8)

-- Patch Links --

https://github.com/vim/vim/pull/21013.patch
https://github.com/vim/vim/pull/21013.diff

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