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This is not only true for poland resources, but also for
all other. IF I press AltGr+N key on my german keyboard, I
get back from the framework the same key combo as for
Ctrl+N. Dunno, how to get around that -I cannot find any
appropriate Keys enum for AltGr, think it is simply mapped
to Ctrl. So it seems we have to live with that issue.

As a workaround you can define a completely new shortcut
command for "BrowserCreateNewTab" with the help of the
ShortcutManager application provided in the installation