[gtk] (4 commits) Non-fast-forward update to branch wip/jimmac/menu-shadow-clipping-workaround

[Jakub Steiner <jimmac src gnome org>]

The branch 'wip/jimmac/menu-shadow-clipping-workaround' 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:

  964bb51... Adwaita: unified sidebar styles (fixed)
  acb00ac... Adwaita: workaround shadow clipping

Commits added to the branch:

  b3dba1d... Adwaita: avoid clipping menu shadows (*)
  ab163f1... Merge branch 'wip/jimmac/clipped-menu-shadows' into 'master (*)
  6937830... Adwaita: unified sidebar styles (fixed)
  5baf7c8... Adwaita: work around popover shadow clipping

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