[gtk] (12 commits) ...Merge branch 'focus-adjustment' into 'master'

[Matthias Clasen <matthiasc src gnome org>]

Summary of changes:

  323394e... emojichooser: Drop focus adjustment setting (*)
  8e45e15... colorchooser: Fix a crash (*)
  2500362... widget-factory: Make color swatches non-focusable (*)
  66347fa... viewport: Add GtkViewport:scroll-to-focus (*)
  b315dce... Add a test for scroll-to-focus (*)
  13b6b9f... scrolledwindow: Stop setting focus adjustments (*)
  b339bde... inspector: Use the new scroll-to-focus (*)
  ee4a779... flowbox: Stop setting focus adjustments (*)
  8c0fbb2... tests: Stop using focus adjustments (*)
  1c472cc... Drop gtk_container_set_focus_[hv]adjustment (*)
  b55b177... docs: Mention focus adjustments in the migration guide (*)
  1e7c56d... Merge branch 'focus-adjustment' into 'master'

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