[gtk] (19 commits) ...scale: Remove useless extra local variable

[Timm Bäder <baedert src gnome org>]

Summary of changes:

  188f00e... stack: Add GtkStackPage:visible accessors (*)
  b5d4815... aboutdialog: Use new GtkStackPage API (*)
  2bf9a5b... aboutdialog: Replace visited_links GList with GPtrArray (*)
  ec6d583... modelbutton: Un-select on mouse leave (*)
  2ad6c04... aboutdialog: Clarify docs and fix preconditions (*)
  a1bc3ae... popvermenu: Clarify css node docs (*)
  e18a159... spinbutton: Remove manual queue_draw() calls (*)
  63bb1c2... docs: Remove dnd_internals.txt (*)
  d3936f8... docs: Remove developers.txt (*)
  d8a61b3... docs: Remove focus_tracking.txt (*)
  64d0f84... text: Remove gtk_text_get_im_context() (*)
  194039c... filechooserwidget: Remove unused constants (*)
  b8a752c... filechooserwidget: Allow typing a location in recent mode (*)
  b58f9e2... filechoosererrorstack: Set a layout manager (*)
  c0de025... filechooserwidget: Use a proper GtkPopoverMenu (*)
  f14978c... filechooserwidget: Fold function into only caller (*)
  faddbb1... emojichooser: Add style class to emoji toolbar (*)
  aa53fef... scale: Remove unused member (*)
  0188706... scale: Remove useless extra local variable

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