[gtk+] (27 commits) Non-fast-forward update to branch wip/native-file-chooser

[Alexander Larsson <alexl src gnome org>]

The branch 'wip/native-file-chooser' 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:

  1db7dc5... TreeModelFilter: Fix uninitialized memory read.
  444766c... Make GtkFileChooser interface require a GObject
  903f18e... Add GtkNativeDialog base class
  2bc4d57... GtkFileFilter: Add private function to represent filter as 
  1cde65e... GtkFileChooserNative: Fallback and win32 implementation
  b25b4cf... GtkFileChooserButton: Use native dialogs
  cc7d2a3... testgtk: Add native dialog tests

Commits added to the branch:

  d40576f... revealer: Use an element name (*)
  cca5cac... paned: Move .wide to CSS subnode (*)
  eade244... popover: Add the .background style class (*)
  9d4c78c... progressbar: Add a CSS node for trough (*)
  48e605b... Adwaita: Update progressbar styling (*)
  894bd13... HighContrast: Update progressbar styling (*)
  c580a9d... tests: Make stack expand (*)
  b6b00c3... stack: Queue a resize/allocate when switching children (*)
  2bfb5ad... range: Add a CSS node for the trough (*)
  1261aa6... Adwaita: Update range styling (*)
  9f3deaa... HighContrast: Update range styling (*)
  973836d... range: Add private api to get the trough node (*)
  07841f2... scale: Split marks node into two (*)
  53ae100... Adwaita: Update scale styling (*)
  8afb4a6... HighContrast: Update scale styling (*)
  2e31494... range: Redraw when slider visiblity changes (*)
  a71bc24... file chooser: Don't use .search-bar for a box (*)
  bec58dc... searchbar: Stop adding a style class (*)
  87c6ae1... Adwaita: Update searchbar styling (*)
  37c923a... HighContrast: Update filechooser styling (*)
  d89f51b... TreeModelFilter: Fix uninitialized memory read.
  3b5f950... Make GtkFileChooser interface require a GObject
  e675949... Add GtkNativeDialog abstract base class
  d1dfb9f... GtkFileFilter: Add private function to represent filter as 
  6997985... GtkFileChooserNative: Fallback and win32 implementation
  164f90b... GtkFileChooserButton: Use native dialogs
  afc5926... testgtk: Add native dialog tests

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