827c71199d
If the user double clicks a branch in the checkout dialog then they probably want to start the checkout process on that branch. I found myself doing this without realizing it, and of course it did nothing as there was no action bound to the listbox's Double-Button-1 event handler. Since I did it without thinking, others will probably also try, and expect the same behavior. Signed-off-by: Shawn O. Pearce <spearce@spearce.org>