Created attachment 161559 [details]
The vertical text in the sidebar that is configurable in Kate

SUMMARY
In Kate, it is possible to configure the sidebar to have vertical text. This is also supported in other, non-KDE, apps such as the Clementine music player. This would be beneficial for users with small screens, as it would reduce the screen real estate occupied by the sidebar.

There is an alternative in only using icons, but this is generally less compact, and removes the text entirely making it in my opinion less clear. Additionally the buttons become rather small for Fitt's law.

STEPS TO REPRODUCE
1. Right click sidebar
2. See no option for "Show Text & Icons" but vertically

OBSERVED RESULT
No option for vertical text

EXPECTED RESULT
An option for vertical text to reduce the size occupied by the sidebar, similar to what is shown in the attachment.

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

ADDITIONAL INFORMATION