New features to do:
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Add modifiers latch and lock for Xorg.
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Add debuging to check API version.
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Make indicator as for system (Shows also in login & lock screen) Won't fix as Gnome drop the option, So only with Gnome modification. See https://discourse.gnome.org/t/is-there-any-way-to-enable-extensions-on-gdm/5717?u=userdz