[gtk] (12 commits) ...Merge branch 'wip/baedert/for-master' into 'master'

[Matthias Clasen <matthiasc src gnome org>]

Summary of changes:

  aedc956... renderboder: Ignore transparent outlines (*)
  ef2af52... widget: Remove size allocate signal enum member (*)
  167c611... widget: Move adjusted size calculation below early-out goto (*)
  949eb8d... node-editor: Monitor file and reload on changes (*)
  b9ed957... gl renderer: Fix nested rounded clip rendering (*)
  f78c167... cssvalue: Add class check to transition (*)
  9e0bf35... paned: Fix up the docs once more (*)
  8a7fb4b... widget: Make 1 if out of 2 ifs (*)
  ddaf50d... window: Create constraint solver on demand (*)
  a50bf27... main: Inline propagate_{down,up} in propagate_internal() (*)
  9149c79... window: Restructure gtk_window_destroy() (*)
  ab148c0... Merge branch 'wip/baedert/for-master' into 'master'

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