[gimp] (7 commits) Non-fast-forward update to branch wip/Jehan/incremental-win-installer-improvements

[Jehan <jehanp src gnome org>]

The branch 'wip/Jehan/incremental-win-installer-improvements' was changed in a way that was not a 
fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  8edec4f... build: custom GTK3 compilation for the Windows installer.
  a1d38a6... Plop.

Commits added to the branch:

  68851c1... Issue #5875: Close button too big on wayland backend. (*)
  3d9996f... Issue #6869: Toolbox buttons should focus the canvas as sid (*)
  2d123b8... app: fix wrong unref-ing. (*)
  086ae77... app: new gimp_display_grab_focus() function. (*)
  d3105e5... app: add a comment and some newlines before the debug data  (*)
  bfa26bb... build: custom GTK3 compilation for the Windows installer.
  8d9b15d... Plop.

(*) This commit already existed in another branch; no separate mail sent