ALT + Alphanumeric as KeyCombination prints the typed symbol

[arturbosch]

I want to implement some shortkeys as ALT+1 to switch to a project explorer, but the 1 is printed everytime I press this combination in a code area. In a JavaFX TextArea this is not the default behaviour.

Is this intentionally or a bug?

Duplicate of #350 ?

[JordanMartinez]

Aye, seems to be a duplicate. Reopen if you think otherwise.