[gtk] (19 commits) Non-fast-forward update to branch wip/chergert/fix-class-private-data-usage

[Christian Hergert <chergert src gnome org>]

The branch 'wip/chergert/fix-class-private-data-usage' 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:

  da2356d... widget: move class private data to gtkwidgetprivate.h
  a8d7be5... widget: fix class private data usage to be _init() safe

Commits added to the branch:

  068ec58... testsuite: Fix the accessible test (*)
  cf7dc5b... testsuite: Don't g_print from tests (*)
  68e1c8d... gsk: Don't unconditionally spew to stdout (*)
  c893f79... reftests: Don't run tests with --verbose (*)
  0264a64... gtktexthandle: Refactor and use native surfaces (*)
  0f73e83... gtkwindow: Remove internal popover API (*)
  6431bdc... gtkpopover: Ensure the pointed to rectangle has a minimum w (*)
  9a0b70f... gtkpopover: Re-present surface if position/pointing-to chan (*)
  54a4a18... gtktext: Set magnifier popover on top (*)
  23f03ca... gtktextview: Set magnifier popover on top (*)
  dc4b713... testsuite: Don't exit unsuccessfully when using TAP (*)
  9403f44... reftests: Fix an xfail to work (*)
  cbb0ca4... testsuite: Tell meson we use TAP (*)
  9eda683... testsuite: Fix an a11y test (*)
  fa4be71... Merge branch 'wip/carlosg/text-handle-natives' into 'master (*)
  c7caa53... testsuite: disable performance tests (*)
  5b2cdad... Merge branch 'test-protocol' into 'master' (*)
  6822dce... widget: move class private data to gtkwidgetprivate.h
  ccac404... widget: fix class private data usage to be _init() safe

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