[gtk] (16 commits) ...Merge branch 'matthiasc/for-master' into 'master'

[Matthias Clasen <matthiasc src gnome org>]

Summary of changes:

  3f54832... textview: Give attached children a different css name (*)
  10921aa... textview: Ensure popup menu is properly inserted (*)
  9d4b01f... testsuite: Use lowercase component in test paths (*)
  caab6ac... testsuite: Add more tests for automated components (*)
  2b920b2... print-editor: Fix a critical (*)
  756720f... print-editor: Cosmetics (*)
  a11119d... treeview: Ensure search popover is properly inserted (*)
  3a5cf61... print dialog: Fix frame <> box confusion (*)
  6140daf... builderscope: Fix finalize <> dispose confusion (*)
  d798527... treeviewcolumn: Another case of box <> frame confusion (*)
  1b8a025... Clean up a leak in a test (*)
  0fc1a29... docs: Cosmetic updates to the tutorial (*)
  4de4957... applicationswindow: Make show-menubar FALSE by default (*)
  d2430c7... Refresh the tutorial examples (*)
  0e18e52... menubutton: Cosmetics (*)
  9f3fb69... Merge branch 'matthiasc/for-master' into 'master'

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