[gtk] (23 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:

  7f05952... testblur: Fix default blur radius
  52f1c40... gl renderer: Blur shader improvements
  c7465d9... gl renderer: Add some often needed debug code
  803593c... gl renderer: Scale blur radius
  e37cb85... gl renderer: Take a TextureRegion in blur_texture
  bc49716... gl renderer: Implement blurred shadow nodes
  576d5b7... snapshot: Factor out color matrix merging
  ef24481... snapshot: Reorder color matrix nodes containing a transform
  9886e4f... window: Don't set invalid csd input shape
  ca8536b... gl renderer: Save one level of indentation
  8a050d9... cssshadowvalue: Simplify inset shadow nodes to color nodes 
  89a5e98... gl renderer: Cache current scale in RenderOpBuilder

Commits added to the branch:

  7bb8a48... Adwaita: always use link specific colors for link selector (*)
  85950af... builder-tool: Fix handling of layout properties (*)
  c3ca34c... Merge branch 'matthiasc/for-master' into 'master' (*)
  174cdb0... Add a test for the previous fix (*)
  dd52dd8... Update the test scripts (*)
  6c4ab7d... Merge branch 'matthiasc/for-master' into 'master' (*)
  fe385c2... Merge branch 'gtk-link-color' into 'master' (*)
  2e1a231... testblur: Fix default blur radius
  8cdceb0... gl renderer: Blur shader improvements
  325de75... gl renderer: Add some often needed debug code
  ff07b1a... gl renderer: Scale blur radius
  ba96c2b... gl renderer: Take a TextureRegion in blur_texture
  88449ef... gl renderer: Implement blurred shadow nodes
  8e2cefa... snapshot: Factor out color matrix merging
  828e523... snapshot: Reorder color matrix nodes containing a transform
  3c015ac... window: Don't set invalid csd input shape
  5ef0d55... gl renderer: Save one level of indentation
  d3290db... cssshadowvalue: Simplify inset shadow nodes to color nodes 
  2944d4e... gl renderer: Cache current scale in RenderOpBuilder
  f31fed1... testsuite: Add an inset shadow rendering test case
  1778a58... opbuffer: Remove unused op member
  5059fe2... gl renderer: Remove unused uniform from inset shadow shader
  9842daf... gl renderer: Implement blurred inset shadow nodes

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