[gtk] (16 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:

  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
  c718eb4... range: Avoid rounding errors when allocating highlight
  a570b4f... coloreditor: Scale h value to 360
  73e1026... Adwaita: Add focus outlines back to scale troughs
  a59572c... widget: Use get_css_name() in get_property()
  5b46ccc... calendar: Emit {next,prev}-{month,year} signals

Commits added to the branch:

  e5d83ee... events: Make proximity and scroll events have tools (*)
  43a9f9b... calendar: Document style classes (*)
  a1d47ec... calendar: Add style class to today's label (*)
  3cc57c2... actionbar: Use a bin layout (*)
  a7de8e6... infobar: Don't store close button visibility separately (*)
  8612a8a... testinfobar: Stop using gtk_info_bar_get_content_area() (*)
  78a5bf8... Remove gtk_info_bar_get_content_area() uses (*)
  52979a0... infobar: Remove _get_{action,content}_area() (*)
  7e43034... widget: Add css-classes property (*)
  2529464... range: Avoid rounding errors when allocating highlight (*)
  bf839db... coloreditor: Scale h value to 360 (*)
  28482e5... Adwaita: Add focus outlines back to scale troughs (*)
  a4ecfd8... widget: Use get_css_name() in get_property() (*)
  08501c9... calendar: Emit {next,prev}-{month,year} signals (*)
  12e62f8... stack: Add GtkStackPage:visible accessors
  d3ab39f... aboutdialog: Use new GtkStackPage API

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