"Discard to Stash": option to show dialog for entering name

Currently, "Discard to stash" will directly create the stash, and users will need to go to the Stash tree to rename the entry.  

It would be nice if a textbox would appear after "Discard to stash" is clicked, similar to how "Commit" button works.  If this is not desired for the general public, perhaps make it an advanced option.