[gtk] (10 commits) ...Merge branch 'master.win32' into 'master'

[Matthias Clasen <matthiasc src gnome org>]

Summary of changes:

  06f28af... gdksurface-win32.c: Fix Aerosnap computation (*)
  69bb4f8... GDK-Win32: Move some functions around (*)
  c6ada2a... gdksurface-win32.c: Add function to handle queued moves/res (*)
  46a8a3f... gdk[cairo|gl]context-win32.c: Use gdk_win32_surface_handle_ (*)
  5ce0098... gdkvulkancontext-win32.c: Implement ->begin_frame() (*)
  d2291ab... gdksurface-win32.c: Fix resizing (*)
  cf5a6a0... testsuite: Setup tests env by platform (*)
  f454c6f... testsuite/gsk: Only run Broadway tests if enabled (*)
  edc1c28... GdkGLContext: Drop gdk_gl_context_has_[framebuffer_blit|fra (*)
  c46f262... Merge branch 'master.win32' into 'master'

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