[gtk] (7 commits) ...Merge branch 'wip/exalm/textview-selection' into 'master'

[Matthias Clasen <matthiasc src gnome org>]

Summary of changes:

  f413d5e... textlayout: Only special case selection rendering for opaqu (*)
  0fa4b7a... textview: Invalidate selection when its style changes (*)
  167134e... textlayout: Support fully transparent selection text (*)
  70ee86c... textlayout: Clip selection bounds to the line extents (*)
  e4832a9... text: Queue redraw on state changes (*)
  316c783... label: Update selection node and redraw on state changes (*)
  da613c5... Merge branch 'wip/exalm/textview-selection' into 'master'

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