Edit Caption - make more natural

[meteorquake]

Currently you can right-click a caption title, Edit Caption, enter a new caption, hit Enter.
As this is a very common task (certainly for me, I'm sure not just only me) it would be nice to make it as natural as possible.

• Make it easier to enter the edit mode - just click in the title to edit (ideally; then the '*' indicating an edited file would need to temporarily vanish for the edit), or double-click it or ctrl-click into it. This can also be put against the menu item as a reminder.

• Allow for just clicking out of the edited caption to commit it (rather than requiring Enter, which should also work). Currently if you click out of it you lose your edit without any warning which should be regarded as a bug.

Cheers, David