What is the Windows keyboard shortcut for changing case in selected text?

for when we use F2 to rename filenames and after that I want to change the case of those filenames

Solution 1:

Well, here's a quick AutoHotkey script I threw together which is tailored to your specific situation (tested and working):

!r::
save := ClipboardAll
Send ^c
clipwait
oldclip := Clipboard
StringLower, newclip, oldclip
If (newclip == oldclip)
{
    StringUpper, newclip, oldclip
}
Clipboard := newclip
Send ^v{Enter}
Clipboard := save
return

After pressing F2 to rename, using Alt + r will change the folder's case. If you want to swap case of each letter separately, well, that's something different entirely. I know most people on here aren't very appreciative of animated GIFs embedded directly on the page, so if you'd like to see it in action, click here.

Solution 2:

There is indeed an AutoHotkey script for this as suggested by outsideblasts in the comments.

Check out toggle/cycle through capitalize-lowercase-uppercase in the AutoHotkey forums. The final version of the script is at the bottom of the page. Select all the code, put it in a .ahk script and run it (it implies you have AutoHotkey installed of course).

I tested it and it works fine in the Explorer and most editors. When the filename is selected, use CTRL+SHIFT+u to toggle the case of the text.