If ActiveStoryItem's SelectionArea contains items, Copy and Cut/Delete shouldn't act on ActiveStoryItem

[birbilis]

Version: 0.7.7

Currently Copy action serializes (in text format) ActiveStoryItem to the clipboard.
This confuses users often, so it should only do this when ActiveStoryItem doesn't have a SelectedArea that contains items.

In that case it should copy the items provided by the SelectedArea (currently it is set to be the frontmost item [from Z-order], but in the future could be changed to all items it includes [SelectedArea already supports that]).

Same issue exists with Cut (Delete when SHIFT is pressed) action.

[birbilis]

In that case some open array (or other collection like List) object should probably be placed in the clipboard and the Paste code (which pastes into ActiveStoryItem as usual) could handle that case and paste in multiple objects (taken from the deserialized from clipboard array/collection).

If multiple SelectedAreas inside the same ActiveStoryItem are supported in the future, they should be handled similarly