I've tried to verify this bug. With Xubuntu 16.04 (daily iso) amd64, syntax highlighting works on css and desktop files. I don't have test with gtkrc files as I don't know this kind of files.
Mousepad version : 0.4.0-3ubuntu1 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1537337 Title: Syntax highlighting no more working in 4.0 mousepad version To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/mousepad/+bug/1537337/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs