[gtk] (13 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:

  c2a5a6a... testblur: Fix default blur radius
  70a6159... gl renderer: Blur shader improvements
  6935027... gl renderer: Add some often needed debug code
  7cd3d09... gl renderer: Scale blur radius
  9aedb24... gl renderer: Take a TextureRegion in blur_texture
  f1bcf4f... gl renderer: Implement blurred shadow nodes
  e89a2b9... snapshot: Factor out color matrix merging
  b559c20... snapshot: Reorder color matrix nodes containing a transform
  286783d... window: Don't set invalid csd input shape
  05de743... Revert "widget-factory: Fix a popover menu"
  aeb5acf... gl renderer: Save one level of indentation
  3f6b6ee... cssshadowvalue: Simplify inset shadow nodes to color nodes 

Commits added to the branch:

  da063a8... Fix up widget-factory ui (*)
  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
  474a41e... cssshadowvalue: Simplify inset shadow nodes to color nodes 
  1755599... gl renderer: Cache current scale in RenderNodeBuilder

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