[gtk] (29 commits) Non-fast-forward update to branch wip/exalm/buttons

[Alexander Mikhaylenko <alexm src gnome org>]

The branch 'wip/exalm/buttons' 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:

  afaea2b... menubutton: Support custom children

Commits added to the branch:

  52cdf30... compose: Generate endian-dependent compact Compose data (*)
  11c2d9e... compose: Document how to get compose-parse input from libX1 (*)
  1071818... compose: Update sequences from libX11 1.7.2 (*)
  3667c6b... Merge branch 'wip/smcv/compose-files' into 'master' (*)
  733fb52... Revert "reftests: Enforce default settings" (*)
  a4f0674... gdk: Make GDK_DEBUG=default-settings unconditional (*)
  9f73f02... Merge branch 'default-settings-non-debug' into 'master' (*)
  fa57b00... editable: Clarify the docs (*)
  9713c33... Merge branch 'matthiasc/for-master' into 'master' (*)
  cb38ead... Update Persian translation (*)
  8550a04... Update Dutch translation (*)
  b244f31... Use color glyph information from Pango (*)
  4c967d5... Updated Spanish translation (*)
  172d97d... Update Persian translation (*)
  ad3dad1... Initial support for new Pango attributes (*)
  76a8eb4... Merge branch 'matthiasc/for-master' into 'master' (*)
  2c06066... media: Check for gstreamer verion instead of using cc.links (*)
  4dc0e67... Merge branch 'color-glyph-info' into 'master' (*)
  b26a370... Add a gtk-hint-font-metrics setting (*)
  67495fc... Update settings tests (*)
  486cffc... Merge branch 'hint-metrics-setting' into 'master' (*)
  c002678... Merge branch 'fix-gst-subproject' into 'master' (*)
  9e198a5... Updated Lithuanian translation (*)
  82a184a... Update Finnish translation (*)
  16b9a30... reftest-compare: Treat colour channels as undefined if alph (*)
  a45cbad... Merge branch 'wip/smcv/transparent-is-transparent' into 'ma (*)
  d4b7a78... Add a README in gtk/compose (*)
  e681fdd... Merge branch 'matthiasc/for-master' into 'master' (*)
  cd701fa... menubutton: Support custom children

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