This bug was fixed in the package ubuntu-mate-artwork - 17.04.9
--------------- ubuntu-mate-artwork (17.04.9) zesty; urgency=medium
* Fix GTK2+ radio and checkbox assets to match GTK3+. (LP: #1046129) * Fix GTK2+ Notebooks, Progress bars and Sliders so they match GTK3+. * Fix GTK2+ Ambiant-MATE so that Qt4/Qt5 applications are styled correctly. * Fix GTK2+ runtime warnings. * Fix GTK2+ and GTK3+ Notebook background and font colours. * Fix GTK3+ switches, particularly in headerbars. * Fix GTK3+ button hover focus. * Fix background and colours for MATE Terminal and GNOME Terminal. * Fix box-shadow on desktop windows. * Fix styling for Brisk Menu and MATE Menu. * Fix popover modelbuttons. * Fix solid-csd border colors. * Fix border images for Ambiant-MATE Dark. * Add missing gtkstyle-fallback settings. * Add missing GtkSourceView styles for Ambiant-MATE-Dark. * Add Ubuntu MATE community contributed wallpaper, Ubuntu MATE Wet. * Remove obsolete GTK2+ styling.
-- Martin Wimpress <email address hidden> Sun, 26 Mar 2017 21:38:38 +0100
This bug was fixed in the package ubuntu-mate-artwork - 17.04.9
---------------
ubuntu-mate-artwork (17.04.9) zesty; urgency=medium
* Fix GTK2+ radio and checkbox assets to match GTK3+. (LP: #1046129)
* Fix GTK2+ Notebooks, Progress bars and Sliders so they match GTK3+.
* Fix GTK2+ Ambiant-MATE so that Qt4/Qt5 applications are styled correctly.
* Fix GTK2+ runtime warnings.
* Fix GTK2+ and GTK3+ Notebook background and font colours.
* Fix GTK3+ switches, particularly in headerbars.
* Fix GTK3+ button hover focus.
* Fix background and colours for MATE Terminal and GNOME Terminal.
* Fix box-shadow on desktop windows.
* Fix styling for Brisk Menu and MATE Menu.
* Fix popover modelbuttons.
* Fix solid-csd border colors.
* Fix border images for Ambiant-MATE Dark.
* Add missing gtkstyle-fallback settings.
* Add missing GtkSourceView styles for Ambiant-MATE-Dark.
* Add Ubuntu MATE community contributed wallpaper, Ubuntu MATE Wet.
* Remove obsolete GTK2+ styling.
-- Martin Wimpress <email address hidden> Sun, 26 Mar 2017 21:38:38 +0100