[gtk] (21 commits) Non-fast-forward update to branch wip/albfan/offscreen-window

[Alberto Fanjul <albfan src gnome org>]

The branch 'wip/albfan/offscreen-window' 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:

  83a8781... Prevent crashes on gdk wayland implementation using offscre

Commits added to the branch:

  30906f3... Adwaita: lower glyph contrast for checkboxes (*)
  1f9f370... Merge branch 'wip/jimmac/gtk3-uniform-checkboxes' into 'gtk (*)
  16b4ae8... HC: export public colors (*)
  e127478... Merge branch 'wip/jimmac/gtk3-public-hc-colors' into 'gtk-3 (*)
  d46aa9f... theme: Fix decoration background (*)
  be159ab... Merge branch 'wip/exalm/solid-csd' into 'gtk-3-24' (*)
  1697be5... Fix function signature (*)
  e6e8617... Merge branch 'fix-signature-mismatch' into 'gtk-3-24' (*)
  2171589... GDK W32: Correctly infer gtk-xft-antialias & gtk-xft-rgba (*)
  95fd384... Merge branch 'gtk-3-24-w32-xsettings-defaults' into 'gtk-3- (*)
  326077d... file-system-model: Avoid use-after free (*)
  3b5e10e... file-system-model: Refactor a helper (*)
  521a382... HighContrast: regenerate css (*)
  53a481b... 3.24.19 (*)
  db39ce2... Bump to 3.24.20 (*)
  c348d78... Add interface age to the version check (*)
  00aaba4... meson: Sync up the interface age (*)
  2e2e22a... Merge branch 'ci-version-check' into 'gtk-3-24' (*)
  c2f51e1... Add check-version.py to the Autotools dist (*)
  0576aff... Merge branch 'missing-dist' into 'gtk-3-24' (*)
  5a70269... Prevent crashes on gdk wayland implementation using offscre

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