[gtk] (11 commits) ...Merge branch 'wip/baedert/for-master' into 'master'

[Timm Bäder <baedert src gnome org>]

Summary of changes:

  84d2a33... gl renderer: Support scaleX/Y better when rendering radial  (*)
  467be0b... gl renderer: Don't use ops_get_scale() when rendering clip  (*)
  15994db... gl renderer: Use scale_x/y when rendering clipped nodes (*)
  9eaa8bd... gl renderer: Only return error if creating programs failed (*)
  12cc178... textbuffer: Don't try to inset NULL text from clipboard (*)
  8d7b3ba... gl renderer: Fall back to cairo if gradients use too many s (*)
  fd728ea... gl renderer: Lower maximum gradient stop count (*)
  716b5af... Adwaita: Fix calendar header button backdrop bg color (*)
  484dcc0... cssimagefallback: Avoid allocating GPtrArray for colors (*)
  2f93287... cssimagefallback: Whitespace (*)
  09564a5... Merge branch 'wip/baedert/for-master' into 'master'

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