Right click to "Edit event comment" ends editting selected photo comment
Mandatory: Shotwell version the issue was seen with
0.30.10 – “Celle”
The expected behaviour
Right clicking on an event and selecting "Edit event comment..." should take action over the event comment and not on the Photo's comments.
What was actually happening
If you have one or more photos selected this action leads to "Edit Photo/Video Comment" dialogue (instead of editing event's comment)
Steps to reproduce the issue
Select an event, select at least one photo on the event, right click on event > select "Edit event Comment". You'll see that you're really editing the photos/videos comments instead of event's comment.
Workaround: edit event comment without photos selected.