[gtk] (26 commits) Non-fast-forward update to branch icontheme-api

[Matthias Clasen <matthiasc src gnome org>]

The branch 'icontheme-api' 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:

  fcfeace... Make gtk_icon_theme_list_icons return a string array
  14a21b6... icontheme: Update the api
  2cd39a6... testsuite: Skip icontheme properties

Commits added to the branch:

  5a726bc... drop: Add a state machine for tracking events (*)
  762c460... wayland: Destroy the offer on gdk_drop_finish() (*)
  8d2ed36... contentprovider: Add gdk_content_provider_new_typed() (*)
  dbad440... testdnd3: Use GValue dnd (*)
  da83457... dnd: Remove gdk_content_provider_new_with_callback() (*)
  e1f8c14... dnd: simplify code (*)
  3a7e3cf... dragdest: Simplify function (*)
  91d91a2... colorbutton, colorswatch: Simplify DND (*)
  80ba7fd... dragdest: Make gtk_drop_target_new() args be transfer full (*)
  f5e3584... placessidebar: Don't claim to support text dnd (*)
  a838a54... text: Treat Emoji insertion like clipboard (*)
  9a7607b... contentprovider: Add a union content provider (*)
  e25bfa6... dragdest: Handle NULL content formats everywhere (*)
  9703fcc... notebook: Move dnd scrolling via arrows to own drop target (*)
  27d7aa1... notebook: Use proper DND (*)
  1145da3... placessidebar: Modernize DND (*)
  308d2ca... Merge branch 'text-emoji-history' into 'master' (*)
  b8cf7ea... dnd: Port the TreeModel machinery to GValue DND (*)
  7ae5fd3... tests: Modernize testdnd2 (*)
  7ca149f... Remove gdk_content_provider_new_with_formats() (*)
  0d4d4e9... colorbutton: Fix drag source (*)
  8378eb2... GtkDialog: Add `type Gtk.HeaderBar` annotation to headerbar (*)
  e64cce2... Merge branch 'dialog-headerbar-type-annotation' into 'maste (*)
  03ee422... Merge branch 'wip/otte/dnd' into 'master' (*)
  c1032df... Make gtk_icon_theme_list_icons return a string array
  0b289e4... icontheme: Update the api

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