#131 Alternate "Move tab to" behavior

[dav7]

When one opens a new window with the sole intention of moving already opened documents into it, then they move the desired documents over, the initial "Untitled" tab is not replaced with the first document that is moved over.

A visual analysis:

Here's the window we're about to move the document(s) into. Its tab structure looks like this:
[ Untitled]

When I move the document(s) in, it changes to
[ Untitled ] [ Document 1 ] [ Document 2 ]

What I'd like to occur is that the "Untitled" tab is replaced with "Document 1", so that it goes such like
[ Document 1 ] [ Document 2]

Not a very major issue, but a nice thing to have nonetheless. This would undoubtedly want to be made an option, since different users are going to have different preferences on something like this.

-dav7