[gtk] (17 commits) Non-fast-forward update to branch matthiasc/for-master

[Matthias Clasen <matthiasc src gnome org>]

The branch 'matthiasc/for-master' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  1b453ac... Don't hide widgets in dispose()
  929581f... gtk-demo: Split off SvgPaintable

Commits added to the branch:

  db6d7dc... Drop “gtk+” plus sign in GtkBuilder <requires>. (*)
  e6d46ec... Teach `gtk-builder-tool` to rewrite <requires>. (*)
  08f2990... Document the GtkBuilder <requires> tag changes. (*)
  f7de0bc... Fix tests with regard to GtkBuilder <requires>. (*)
  d69a943... gtk: Remove <requires> from ui files (*)
  d6c753b... gtk4-demo: Remove <requires> from ui files (*)
  9b056f5... examples: Remove requires from ui files (*)
  18779b9... testsuite: Remove <requires> from ui files (*)
  e4be785... builder: Be a bit more strict about requires (*)
  7215c74... buildertool: Supplant a requires (*)
  d6a0948... testsuite: Update buildertool tests (*)
  a76f37a... gtk-demo: Fix building scrolling demo without PangoFT2 (*)
  a047b7d... Merge branch 'fix-demos-wo-pangoft2' into 'master' (*)
  74a7f73... Merge branch 'matthiasc/builder-requires' into 'master' (*)
  27c4c19... Don't hide widgets in dispose()
  5ed3ad6... gtk-demo: Split off SvgPaintable
  7945069... label: Optimize gtk_label_set_text

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