[Improvement] enter edit mode

[arcturus140]

1. would be nice be able to directly edit a snippet. I'd suggest to make a check mark icon appear once edits have been made to save them and discard (unintended) changes otherwise.
   Alternatively, a shortcut to enter edit mode could be handy.

2. I really appreciate it that only an excerpt of the snippet is displayed. 💯 I'd like to toggle between excerpt and complete view with double-click on the snippet.