Base class for keys events with modifiers.
Contains keys events information with modifiers support like [code]Shift[/code] or [code]Alt[/code]. See [method Node._input].
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- State of the [code]Alt[/code] modifier.
- State of the [code]Command[/code] modifier.
- State of the [code]Ctrl[/code] modifier.
- State of the [code]Meta[/code] modifier.
- State of the [code]Shift[/code] modifier.