Disable CTRL+ALT+L in Windows 10

Question

I have recently noticed that in Windows 10, double combo CTRL+ALT+L causes screen to lock, exactly like WIN+L.
I have noticed this happening since a while, maybe since 2004 update.
It is frustrating. I instinctively use the combo in IntelliJ IDEA to reformat files every time I finish editing them, but now the system intercepts the first combo and doesn't propagate it to IDEA.
Does anyone know how to disable this combo for lock screen?

Edit: seems like the situation is worse. I can't type @ on my keyboard, in particular with the classic combo Alt Gr+@ (ò). In fact, Alt Gr gets completely ignored even with euro € key.  CTRL+ALT serves as Alt Gr
I tried Spy++ but no process is stealing hotkeys

usr-local-ΕΨΗΕΛΩΝ · Answer

Closing app Mouse without Borders fixed the ctrl alt l issue, but not the @/€ issue
From

Lock/Unlock all machines at once

Hit Ctrl+Alt+L twice to lock all machines. NOTE: If you use a Polish keyboard, Alt+L (to show up the 'ł' letter) would be eaten up in the remote machine so you would better change this hotkey to something else:)

programmer365 · Answer

Maybe you can use AutoHotKey (Download from https://www.autohotkey.com/) for this:
^!L::return

First Save this as .ahk file and run it. Now CTRL+ALT+L hotkey will be disabled.

Disable CTRL+ALT+L in Windows 10

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