[gtk] (11 commits) ...Merge branch 'wip/baedert/filechooser2' into 'master'

[Matthias Clasen <matthiasc src gnome org>]

Summary of changes:

  dcc55e3... Adwaita: Bring filechooserbutton spacing back (*)
  7e20232... colorbutton: Remove unneeded snapshot implementation (*)
  0f6d83b... filechooserbutton: Remove some dead code (*)
  2bd3485... filechooserwidget: Remove some GdkEvent usage (*)
  cf2ef48... filechooserwidget: Don't focus treeview when searching (*)
  78049f4... filechooserwidget: Remove unneeded function prototype (*)
  929cdd9... treeview: Don't always grab_focus() when moving the cursor (*)
  ed4c08d... window: Check whether the new focus widget is the old one (*)
  b75bc8a... filechooserwidget: Allow keynav from the treeview to the se (*)
  5a1c37a... filechooserwidget: Use a center box for the search entry (*)
  34974a8... Merge branch 'wip/baedert/filechooser2' into 'master'

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