[gtk] (14 commits) ...Merge branch 'list-styles' into 'master'

[Matthias Clasen <matthiasc src gnome org>]

Summary of changes:

  221786d... lists: Mention list style classes in docs (*)
  cce3ff6... placessidebar: Use the .navigation-sidebar style class (*)
  0279e1c... inspector: Use the new list style classes (*)
  a9858c6... gtk-demo: Use a style class on the sidebar (*)
  d8753a9... gtk-demo: Use style classes in the settings demo (*)
  283fc9d... gtk-demo: Use style classes in the listbox demo (*)
  d1b1b5b... widget-factory: Use rich-list style (*)
  bdb1d87... Adwaita: style rich-list and data-table (*)
  b49fd47... Adwaita: Fix hover in navigation sidebars (*)
  2b0e954... gtk-demo: take off the makeup (*)
  df4c57c... flatpak: builder options (*)
  c5963b9... Adwaita: fix focus for .navigation-sidebar (*)
  f4561d3... Adwaita: rich-list rows (*)
  e48a1d2... Merge branch 'list-styles' into 'master'

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