Bug#836238: no command line prompt visible after updating GTK+3 to 3.21.5-1

[Viktor Jägersküpper]

Hello Adrian,

I created a new user, opened mate-terminal, everything seemed ok, then
set the theme to "TraditionalOk" which I used with my standard user and
the bug appeared again. I also purged and reinstalled mate-terminal
after that. Then I played around with the themes. With "High contrast",
"TraditionalGreen" and "TraditionalOk" the command line prompt is not
displayed, so it could be a bug in mate-themes. However, in all other
themes the font colour is white and the background is grey (is this
standard?). When I want to change this, mate-terminal crashes (see bug
836239). So with the three themes mentioned mate-terminal is not really
usable for me.

Viktor