[gtk] (38 commits) Non-fast-forward update to branch wip/ebassi/constraint-layout

[Emmanuele Bassi <ebassi src gnome org>]

The branch 'wip/ebassi/constraint-layout' 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:

  be935a4... Add constraint solver
  ba9a554... Move the Root interface to a private header
  84655d8... Assign a GtkConstraintSolver to each GtkRoot
  044cba8... window: Create a GtkConstraintSolver
  796dc2c... Propagate rooting and unrooting widgets to layout managers
  a0c5107... Add GtkConstraintLayout
  ba9b036... Add GtkConstraintLayout demo

Commits added to the branch:

  1e3ec7c... message dialog: Stop hardcoding title styles (*)
  d5f7d85... Merge branch 'message-dialog-title' into 'master' (*)
  0740445... Update POTFILES.in (*)
  f1fe54f... headerbar: Fix fallback appmenu (*)
  1d92fb1... print operation: Reinstate the priv pointer (*)
  2dfda67... Update Hungarian translation (*)
  76b2f97... PrintUnixDialog: Slightly ease page range entry (*)
  7815d0e... Merge branch 'gtkprintunixdialog-ui' into 'master' (*)
  4d06ef5... profiler: add profiler marks for surface event delivery (*)
  4c94f7b... Merge branch 'wip/chergert/profiler-event-marks-4' into 'ma (*)
  732630e... testsuite/a11y/about: Fix exp. output per 31066a69 (*)
  8cfdd6c... Remove an accidental addition (*)
  d2a794b... menu tracker item: Improve logging (*)
  db7f018... action muxer: Add some convenience api (*)
  3b565d7... action muxer: cosmetics (*)
  00c828e... inspector: Redo the action page (*)
  44970b5... inspector: Fix actionable handling (*)
  d2e0d32... widget: Cosmetics (*)
  9bb2d1e... widget: Remove gtk_widget_list_action_prefixes (*)
  72d306c... entry: Remove hacky code (*)
  8209299... file chooser: Stop using gtk_widget_get_action_group (*)
  bc56860... places sidebar: Stop using gtk_widget_get_action_group (*)
  cc66792... Drop gtk_widget_get_action_group (*)
  75713a9... Merge branch 'matthiasc-for-master' into 'master' (*)
  4623642... Update Polish translation (*)
  2457ed0... inspector: Fix centering of subtitles (*)
  3ad8797... inspector: Add a refresh button for actions (*)
  bda5a82... inspector: Don't duplicate popovers (*)
  a5c327b... popover: Drop unused api (*)
  97ba872... Merge branch 'matthiasc-for-master' into 'master' (*)
  aec8da3... Add constraint solver
  13d7f59... Move the Root interface to a private header
  78e86b4... Assign a GtkConstraintSolver to each GtkRoot
  6e8feeb... window: Create a GtkConstraintSolver
  556a51d... Propagate rooting and unrooting widgets to layout managers
  5472cc5... Add GtkConstraintLayout
  5ed66d0... Add GtkConstraintLayout demo
  6835ce4... Do not leak LayoutChild instances

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