[gtk] (9 commits) ...Merge branch 'wip/carlosg/for-master' into 'master'

[Matthias Clasen <matthiasc src gnome org>]

Summary of changes:

  7a4d15d... gtk/range: Move button release handling to GtkGestureDrag (*)
  5155fac... gtk/modelbutton: Handle unpaired releases (*)
  3d84a38... gtk/treeview: Position editable widgets correctly wrt left  (*)
  79090f1... gtk/entrycompletion: Ensure to show first row when shown, n (*)
  8402665... gtk/eventscrollerscroll: Handle smooth events in discrete c (*)
  e9fe270... gtk/scrolledwindow: Handle full scroll sequences only (*)
  612d3bc... gtk/window: Bring back L-shaped resize corners (*)
  8be0918... gdk/surface: Trigger motion check for next frame after thaw (*)
  c2727e6... Merge branch 'wip/carlosg/for-master' into 'master'

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