Shift selection

[asmeurer]

In emacs mode at least (don't know about vi), shift + arrow should do a selection.

This is slightly different from control-space selection, because pressing an arrow without shift should cancel the selection (this is also how most modern GUIs work).

I'm not a vi user, so I don't fully understand what the different selection states mean. Does it make sense to make a new selection type, like SelectionType.SHIFTSELECT, which acts like SelectionType.CHARACTERS except it gets canceled on arrow.

For now, I have implemented this by appending an attribute to the SelectionState object and checking for it on arrow.

[jonathanslenders]

Thank you for this request!

[asmeurer]

I'd be happy to implement this. Just want to know if the SelectionType.SHIFTSELECT idea makes sense.