SUMMARY
When several image files are openend in one window, it is possible to go through them, view one after the other and use the rename function from the file menu. The new name is accepted and Gwenview takes it into the title bar. But the actual file is not renamed. 

When opening only one file in a Gwenview instance, the file is renamed as expected.

STEPS TO REPRODUCE
1. Open 2 or more image files in one Gwenview instance
2. Double-click to view image
3. Click rename from the file menu and enter new file name

OBSERVED RESULT
The file name in the file system it is not changed

EXPECTED RESULT
The file name should be like entered in Gwenview

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

ADDITIONAL INFORMATION