[gtk] (31 commits) ...Merge branch 'debug-envvars-cleanup' into 'main'

[Matthias Clasen <matthiasc src gnome org>]

Summary of changes:

  183709c... Fix default-settings handling (*)
  7785c18... Fix high-depth handling (*)
  1b96828... Make vulkan-validate always available (*)
  a337b21... Make vulkan-disable always available (*)
  a99b055... Make the nograbs flag always available (*)
  fa1c461... Make the portals debug flag always available (*)
  fa0fc9a... Make the gl-disable flag always available (*)
  1987398... Drop the software-gl debug flag (*)
  e08a9ea... Drop the gl-texture-rect debug flag (*)
  8bd3ec2... Make the gl-legacy debug flag always available (*)
  01054c9... Make the gl-gles debug flag always available (*)
  f50b0a0... Make the gl-debug debug flag always available (*)
  55ab99c... Make GL flavor flags always available (*)
  ee1a634... Mark the invert-text-dir flag as always there (*)
  c7a7e55... Only print supported debug flags (*)
  6c95547... docs: Some updates (*)
  10255ee... Introduce new debug macros (*)
  1d48f96... gdk: Use the new debug macros (*)
  90c2b54... broadway: Use the new debug macros (*)
  71fedee... wayland: Use the new debug macros (*)
  ce4c215... x11: Use the new debug macros (*)
  1f166ae... macos: Use the new debug macros (*)
  bc15920... gdk: Drop old debug macros (*)
  4d08eb2... gsk: Introduce new debug macros (*)
  9818ec4... gsk: Use the new debug macros (*)
  8a4fd30... gsk: drop old debug macros (*)
  1e65d66... tests: Rewrite the icontheme tests (*)
  f4d3f45... gtk: Introduce new debug macros (*)
  f33f55b... gtk: Use the new debug macros (*)
  52b6dbf... gtk: Remove old debug macros (*)
  bccb4f8... Merge branch 'debug-envvars-cleanup' into 'main'

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