Jakub Berkop c6bb3d452a LibGUI: Widget::action_for_key_event() should fail for invalid shortcuts (#4137) ...

Previously GUI::Actions which were constructed without initializing
m_shortcut could be activated via an invalid GUI::Shortcut.

Steps to reproduce:
It was possible to enable TextEditor's markdown preview by pressing
Ctrl or Alt (Cmd/Ctrl) keys, which should not happen, as this Action
did not specify a shortcut.

This fix should apply to all other cases where actions where declared
without specifying a shortcut.

2020-11-23 18:41:15 +01:00

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