[gtk] (27 commits) Non-fast-forward update to branch wip/baedert/for-master

[Timm Bäder <baedert src gnome org>]

The branch 'wip/baedert/for-master' 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:

  29412c5... calendar: Document style classes
  acfec62... calendar: Add style class to today's label
  e5b6826... actionbar: Use a bin layout
  d10b475... infobar: Don't store close button visibility separately
  cf442e0... testinfobar: Stop using gtk_info_bar_get_content_area()
  26444eb... Remove gtk_info_bar_get_content_area() uses
  3238363... infobar: Remove _get_{action,content}_area()

Commits added to the branch:

  e75bc17... Remove some unused variables (*)
  b36258f... gdk: Subtract base size when checking aspect ratio (*)
  b6cb1a6... Merge branch 'master-subtract-base-size' into 'master' (*)
  c45ed9d... Merge branch 'zhaoqiang/gtk-To_avoid_compiler_warning' (*)
  980934f... reftests: Change popup windows to non-decorated windows (*)
  922f9df... Merge branch 'wip/otte/for-master' into 'master' (*)
  2c84336... testsuite: Make a11y tests use regular windows (*)
  41bdf16... testsuite: Turn all CSS test ui files into regular windows (*)
  ad23ce2... testsuite: Remove popup property from simplify tools (*)
  264967b... widget: Add gtk_widget_get_css_name() API (*)
  fb856d9... builder: Use different construct-only property (*)
  c2bd4bc... testsuite: Replace popups with toplevels (*)
  a278eda... window: Remove type argument from gtk_window_new() (*)
  de49e47... textview: Fix docs typo (*)
  222e6e5... testsuite: Use GtkTextDirection instead of GtkWindowType (*)
  c1f71ee... window: Remove GtkWindowType and window->type (*)
  723b894... testsuite: Stop using gdk_surface_new_temp (*)
  8ef7013... Drop gdk_surface_new_temp (*)
  5f70548... Merge branch 'wip/otte/for-master' into 'master' (*)
  bf428b8... calendar: Document style classes
  7b18f44... calendar: Add style class to today's label
  1a3f53a... actionbar: Use a bin layout
  891cdb5... infobar: Don't store close button visibility separately
  d25f38b... testinfobar: Stop using gtk_info_bar_get_content_area()
  f86fe4f... Remove gtk_info_bar_get_content_area() uses
  bc9ec98... infobar: Remove _get_{action,content}_area()
  8475796... widget: Add css-classes property

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