Include name of squashed patch in squash edit message.

[topher200]

A possible modification to consider in the stg squash edit message: show the squashed patch name somewhere. Possibly on the first line. E.g.:

# squashed-patch-name is a combination of N patches

or

# Squashing N patches as squashed-patch-name

The latter would be better if reusing the name of one of the patches being squashed (which I often do).

Originally posted by @jpgrayson in #118 (comment)

[topher200]

# Squashing N patches as squashed-patch-name

I like that! I see clearly how it would work if --name is given to stg squash. I'm not as sure how it would work if no --name is provided, because the name will be dependent on the squashed commit message (which is obviously not finalized at the point when we open the editor).

How do you expect it should work for the case where no --name is provided?

[jpgrayson]

Good point. The top line would need to be conditional. Probably just # Squashing N patches if the name is TBD.