[gnome-builder] (16 commits) Non-fast-forward update to branch wip/chergert/326redesign

[Christian Hergert <chergert src gnome org>]

The branch 'wip/chergert/326redesign' 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:

  f5f8345... import recent panel-gtk updates
  d7c9f0b... pnl: ensure group is always initialized via goto
  3f03586... pnl: allow NULL parameters for boolean child properties
  f93bd8d... layout: don't override the css name for the panel
  6c382c8... layout: drop use of custom css element name
  4d788ec... layout: show pinned button for panels

Commits added to the branch:

  4491e30... todo: detect keywords even without colon (*)
  c501f26... todo: add keyword (*)
  f125e4b... clang: try harder to keep iter valid (*)
  5bb2582... sourceview: cleanup assertions (*)
  854174d... sourceview: ensure we have valid textmarks for animations (*)
  7a8facc... flatpak: Fix use-after-free (*)
  f713fe8... flatpak: Write valid JSON when saving manifest (*)
  39997b2... configuration: Make the default config persist (*)
  4fce29c... ctags-builder: fix memory leak (*)
  fc76d45... flatpak: handle NULL parameters gracefully (*)
  dbb062d... import recent panel-gtk updates
  6987b40... pnl: ensure group is always initialized via goto
  649436b... pnl: allow NULL parameters for boolean child properties
  293b007... layout: don't override the css name for the panel
  d72546e... layout: drop use of custom css element name
  4ea2f46... layout: show pinned button for panels

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