alt + shift switch the keyboard layout without indicating it in the keyboard layout menu

In Tails 2.0, alt+shift switch the keyboard layout without changing the layout shown as default in the keyboard layout menu in the top bar.

I think this might also be the cause of what alant experienced in #10961 (closed).

I set priority to elevated because I saw this happen to myself and other people and it’s very confusing.

Feature Branch: bugfix/11042-disable_alt+shift_shortcut

Original created by @segfault on 11042 (Redmine)

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