[gtk] (16 commits) Non-fast-forward update to branch wip/baedert/for-master

[Timm Bäder <baedert src gnome org>]

The branch 'wip/baedert/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:

  9735db0... Start using GtkWidget's new style class API
  3292507... snapshot: Add _push_collect() and _pop_collect()
  26debb7... widget: Use gtk_snapshot_{push,pop})_collect
  e5b8070... widget: Fix a from_string/try_string mixup
  c17406b... GskRoundedRect: Inline graphene_rect_contains_rect
  05f5ace... textlayout: Use gtk_snapshot_{push,pop}_collect()
  bbe0a06... snapshot: Remove new_with_parent
  6dd8b08... GskTransform: add assertions to make normalize_angle() inte
  d731106... GskTransform: Remove useless fmod check
  a09060d... style context: Remove parent relationship
  3928832... widget: Create style context in _init
  d05a01f... {box,grid}layout: Access border spacing directly
  7d7a7d9... calendar: Fix an uninitialized value
  9977ec3... tooltipwindow: Don't manually validate the css node
  9113ca7... Adwaita: Fix levelbar styling
  adc47db... foo

Commits added to the branch:

  dee1209... Start using GtkWidget's new style class API
  0e02997... snapshot: Add _push_collect() and _pop_collect()
  b179c50... widget: Use gtk_snapshot_{push,pop})_collect
  111f5d7... widget: Fix a from_string/try_string mixup
  9ac4074... GskRoundedRect: Inline graphene_rect_contains_rect
  11a6a16... textlayout: Use gtk_snapshot_{push,pop}_collect()
  cb96bcf... snapshot: Remove new_with_parent
  bfe08ce... GskTransform: add assertions to make normalize_angle() inte
  b9ed8a6... GskTransform: Remove useless fmod check
  3958f24... style context: Remove parent relationship
  9becd0c... widget: Create style context in _init
  6f65553... {box,grid}layout: Access border spacing directly
  29b1233... calendar: Fix an uninitialized value
  e0c5a21... tooltipwindow: Don't manually validate the css node
  99373f7... Adwaita: Fix levelbar styling
  12e429e... calendar: Remove details