SUMMARY
In the title bar of Krita, it does not display the filename.

STEPS TO REPRODUCE
1. Open a [filename].kra file
2. Look at the title for the program (at the very top left - above the menu bar [File, Edit, View, etc]. 
3. 

OBSERVED RESULT
It just says ' - Krita', it does not have the filename

EXPECTED RESULT
'Filename - Krita' displayed in the top left hand corner of the program title bar

SOFTWARE/OS VERSIONS
Windows: X
macOS: 
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 
KDE Frameworks Version: 
Qt Version: 

ADDITIONAL INFORMATION
This was working in 4.1.7, after the upgrade to 4.2.1 it is no longer working