Fix to keymapper preventing shift click / multi click

[cnetrebor]

Solved: I had what I thought was an odd problem with KDE Plasma (6 through 6.5.4) on Arch Linux, but it turns out Keymapper was doing something I didn't expect, here is the fix.
Expected behavior: In Dolphin (or file manager of your choice), or in Thunderbird (or email client of your choice), when you Shift Click and then while still holding Shift, click a few files/emails/icons away, instead of selecting all the files/emails/icons, it only selects the last one clicked.
Fix: Add the following to your keymapper.conf (in ~./config): @forward-modifiers Shift Control Alt
Restart the service or reboot.
After that, Shift click does allow selecting multiple files/emails/icons again.

[httpsrichard]

I found your post by chance and this has been a PITA for a while. I owe you a beer or something!