[gtk] (29 commits) Non-fast-forward update to branch theme-reorg

[Matthias Clasen <matthiasc src gnome org>]

The branch 'theme-reorg' 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:

  6751cd0... Reorganize our themes
  3b7ce42... Drop Adwaita and HighContrast themes
  e03129a... Change the default theme to "Default"
  4731621... Make the theme variants available as themes
  19480b6... widget-factory: Use the new themes

Commits added to the branch:

  70e26d1... Update the gi-docgen repository (*)
  f1b3492... ci: Add missing graphviz dependency (*)
  e7dc82f... gstmedia: Properly detect stream metadata when preparing (*)
  d844409... Merge branch 'ebassi/docs-ci' into 'master' (*)
  9e402fa... Merge branch 'wip/otte/for-master' into 'master' (*)
  5f0fe09... Merge branch 'ebassi/for-master' into 'master' (*)
  53e7593... ngl: Add sonme comments (*)
  94f0a4e... ngl: Be explicit about offscreen clipping (*)
  f9457af... ngl: Fix offscreen rendering with transforms (*)
  6f62107... testsuite: Rename next to ngl (*)
  3fdedce... docs: Update the Broadway instructions (*)
  7bfff6c... docs: Update the links to the docs of GTK dependencies (*)
  b5df129... gsk: Add another test (*)
  94747d5... Merge branch 'offscreen-fixes' into 'master' (*)
  fc63e68... Merge branch 'ebassi/docs-links' into 'master' (*)
  65a061f... Merge branch 'ebassi/broadway-docs' into 'master' (*)
  13c22e4... filechooserwidget: Disconnect settings signal on dispose (*)
  2e65416... filechooserwidget: Reduce code duplication for disconnectin (*)
  d7a5ded... scrolledwindow: Cancel overshoot on dimension changes (*)
  1e9e7bf... Merge branch 'wip/exalm/overshoot-changes' into 'master' (*)
  0ea96e3... Merge branch 'filechooser-signal-disconnect' into 'master' (*)
  05e4cd1... snapshot: scale border widths when appending border nodes (*)
  ef455f5... snapshot: Move sanity checks to a better place (*)
  405fab8... Merge branch 'wip/otte/for-master' into 'master' (*)
  0dcf95b... Reorganize our themes
  3654bcf... Make the theme variants available as themes
  8938b09... Change the default theme to "Default"
  e964e17... widget-factory: Use the new themes
  0bf3e4c... Drop Adwaita and HighContrast themes

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