[gtk] (11 commits) ...Merge branch 'gl-api-es-fix' into 'main'

[Benjamin Otte <otte src gnome org>]

Summary of changes:

  0f21f6c... glcontext: Make the creation of EGL context more obvious
  826fdc4... glcontext: Improve documentation on get_use_es api
  6bc3ecb... glcontext: Improve get_version documentation
  8d17580... glcontext: Add internal get_clipped_version function
  d4f8a80... glcontext-win32-wgl: Respect user required version, use dis
  f4f0daa... macosglcontext: Do not rely on default from get_required_ve
  549a2b4... glcontext: Refactor realize function, fix interaction with 
  f97cff1... glcontext-glx: Refactor realize function
  9426b20... glcontext: Do not check for correctness in set_required_ver
  c4feca1... glcontext: Simplify get_required_version api
  45422f7... Merge branch 'gl-api-es-fix' into 'main'