[gtk] (15 commits) Non-fast-forward update to branch deprecate-all-the-cells

[Matthias Clasen <matthiasc src gnome org>]

The branch 'deprecate-all-the-cells' 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:

  100faea... flowbox: Stop using gtk_render_background
  b3057af... inspector: Drop an unused file
  1d87d03... Deprecate treeviews and cell renderers
  5bb6490... demos and examples: Ignore deprecations
  8f1ae08... tools: Ignore deprecations
  d4d9fea... testsuite: Ignore deprecations
  13ddadc... tests: Ignore deprecations

Commits added to the branch:

  3168a3e... gdkcontentserializer: Use newlines for file separators (*)
  8ba7840... Merge branch 'wip/corey/file-clipboard' into 'main' (*)
  141aac1... stringsorter: Add a collation property (*)
  a06a4ad... ci: Allow macos builds to fail (*)
  2520148... Apply 2 suggestion(s) to 2 file(s) (*)
  0532386... stringsorter: Add more detail to the docs (*)
  c419b57... stringsorter: Fix up a doc typo (*)
  933b1eb... Merge branch 'filename-sorter' into 'main' (*)
  681a818... flowbox: Stop using gtk_render_background
  79303d7... inspector: Drop an unused file
  5e25659... Deprecate treeviews and cell renderers
  6efb183... demos and examples: Ignore deprecations
  4941ef6... tools: Ignore deprecations
  c32fed9... testsuite: Ignore deprecations
  69e4c9b... tests: Ignore deprecations

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