[gtk] (16 commits) Non-fast-forward update to branch master.win32

[Chun-wei Fan <fanchunwei src gnome org>]

The branch 'master.win32' 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:

  beab5e0... gtk-demo: Disable `gui_app` attribute
  777f0ab... gdksurface-win32.c: Fix Aerosnap computation
  01dcded... testsuite: Setup tests env by platform
  46d64b9... testsuite/gsk: Only run Broadway tests if enabled
  ad4f5e5... GDK-Win32: Move some functions around
  d870bbd... gdksurface-win32.c: Add function to handle queued moves/res
  6af23b1... gdk[cairo|gl]context-win32.c: Use gdk_win32_surface_handle_
  4c27b66... gdkvulkancontext-win32.c: Implement ->begin_frame()

Commits added to the branch:

  93c9600... docs: Drop GtkPlacesSidebar from visual index (*)
  f561000... docs: Clean up many dangling links (*)
  ce89f1e... selectionfiltermodel: Drop a leftover symbol (*)
  2b8aeed... Drop GtkCallback (*)
  8562c62... Drop GtkAccelLabel (*)
  9126132... Merge branch 'docs-cleanup' into 'master' (*)
  e60d6f7... Merge branch 'drop-accel-label' into 'master' (*)
  43590a6... gtk-demo: Disable `gui_app` attribute
  53b895a... gdksurface-win32.c: Fix Aerosnap computation
  e697ee4... GDK-Win32: Move some functions around
  e61edf0... gdksurface-win32.c: Add function to handle queued moves/res
  cbf1632... gdk[cairo|gl]context-win32.c: Use gdk_win32_surface_handle_
  acf27fe... gdkvulkancontext-win32.c: Implement ->begin_frame()
  27119fc... gdksurface-win32.c: Fix resizing
  b1bb3c3... testsuite: Setup tests env by platform
  d11ce9f... testsuite/gsk: Only run Broadway tests if enabled

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