Ctrl+Tab works Shift+Ctrl+Tab does not

MuseScore 2.0 and 3.0, Windows, any version.
I can use my keyboard to loop between files left-to-right in MuseScore via the Ctrl+Tab key combination. But I cannot navigate right-to-left via Shift+Ctrl+Tab, as is typical in many applications.
It seems like it should be an easy addition, but I'm not familiar with the code.
Use case: Often I have several scores open, but I am currently navigating back-and-forth between only two of them.