The new Micro~~soft~~slop copilot key always sends the following key-sequence when pressed:
copilot key down: left-shift-down left-meta-down f23-down f23-up left-meta-up left-shift-up
copilot key up: <null>
This means there's no real key-up event when you release the key --> it can't be used (properly) as a modifier like ctrl or alt.
The workaround is to send a pretend key-up event after a time delay, but then you mustn't be too slow / fast when pressing a shortcut.
- Linux workaround: https://github.com/m-bartlett/remap-copilot?tab=readme-ov-file
- Windows workaround https://github.com/randyrants/sharpkeys/issues/560
- https://xcancel.com/dcolascione/status/2019936377408811319
tldr: AI took a perfectly working modifier key from you.
--- edit ---
Some keyboards apparently do the "right" thing and don't send the whole sequence at once, you can remap those properly with keyd, see: https://github.com/rvaiya/keyd/issues/1025#issuecomment-2971556563 / https://github.com/rvaiya/keyd/issues/825
copilot key down: left-shift-down left-meta-down f23-down
copilot key up: f23-up left-meta-up left-shift-up
this will still break left-shift + remapped copilot and left-meta + remapped copilot, but RCtrl remaps should work as expected
They (Microsoft) did actually also originally implement it, the application key was added to Microsoft keyboards in 1994 along with the Windows key. It's meant to give compatibility to the Windows user interface when your PC had a mouse with only one button. Don't remember those being very relevant in the recent years.
So it's Microsoft deciding that their right-click button isn't necessary any more after 32 years, and swapping it for a Co-Pilot/Windows Search button.
I use the the 'right click button' literally every single day. It's super useful for not having to move between the mouse and keyboard for tasks.
Also, this is on Linux, and I think it's fair to say that the key has evolved to become a fairly standard part of keyboards and operating systems. Just because MS were the first ones to use it doesn't give them some kind of say control over the idea, at least beyond the scope of their own hardware, and I don't think anyone is arguing that they don't have the right to change their own hardware. It's just a bad decision.