Shift + Delete greys files permanently out

Hello,

I always use shift + delete to delete files in file browsers etc. because it doesn't use the recycle bin, no matter which system I am on. However in the tree views of IDEA derivatives it always greys my files out. I don't know why it does so, but even after deleting and recreating them they're greyed out. What exactly did I do and how can I undo it? Can I change the shortcut somehow? I cannot find any key binding on Shift + Delete.

Regards