[gtk] (10 commits) Non-fast-forward update to branch wip/otte/memoryformat

[Benjamin Otte <otte src gnome org>]

The branch 'wip/otte/memoryformat' 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:

  a8ce0ff... texture: Refactor downloading

Commits added to the branch:

  cd45e6e... dropdown: add GtkDropDown:show-arrow property (*)
  cd2debd... dropdown: fix extraneous * in documentation (*)
  db86b3e... Merge branch 'wip/chergert/dropdown-show-arrow' into 'maste (*)
  2a08641... gsk: Add high depth rendernode api (*)
  9174814... ngl: Allow specifying texture formats (*)
  985d2d2... ngl: Determine intermediate formats (*)
  8a24def... ngl: Update framebuffer format for each frame (*)
  6f17429... ngl: Make render_texture high depth aware (*)
  8d9c392... Merge branch 'wip/matthiasc/gsk-hdr' into 'master' (*)
  61b8df3... texture: Refactor downloading

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