[gtk] (13 commits) Non-fast-forward update to branch wip/jimmac/icon-dropshadows

[Jakub Steiner <jimmac src gnome org>]

The branch 'wip/jimmac/icon-dropshadows' 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:

  f0959c9... GDK W32: Be honest about supported clipboard formats
  8856725... gtkselection: add a W32 tip about image/bmp support
  0e831b7... Update GDK_OSX versions to current MacOS release.
  35d798d... Use [NSGraphicsContext CGContext] instead of graphicsPort a
  7600c4e... Modify Quartz gtk_drag_begin_internal to match 4172138.
  7e4cda6... GdkQuartz: Handle NULL from [NSGraphicsContext currentConte
  c1dbf96... Adwaita: prevent devel styling break selection mode
  041ac5b... Update Esperanto translation
  d483c0a... Updated Slovenian translation
  60dafa3... Merge branch '1411-handle-null-from-nsgraphicscontex' into 
  9c6cf4a... Fix indentation.
  336f382... imwayland: Plug leaks
  d45537a... Merge branch 'win32-honest-clipboard' into 'gtk-3-24'
  8c5158a... Updated Spanish translation
  ab9fa31... Adwaita: help fullcolor app icons

Commits added to the branch:

  dba67f4... GDK W32: Be honest about supported clipboard formats
  82b8ff3... gtkselection: add a W32 tip about image/bmp support
  6a75343... Update GDK_OSX versions to current MacOS release.
  846889d... Use [NSGraphicsContext CGContext] instead of graphicsPort a
  94f6200... Modify Quartz gtk_drag_begin_internal to match 4172138.
  2578f55... GdkQuartz: Handle NULL from [NSGraphicsContext currentConte
  189915d... Adwaita: prevent devel styling break selection mode
  12dd357... Update Esperanto translation
  ea126fd... Updated Slovenian translation
  cc0d683... Fix indentation.
  d02ea03... imwayland: Plug leaks
  c1be0fd... Updated Spanish translation
  3faf33f... Adwaita: help fullcolor app icons