#708 Event editor bugs

[Amirai]

There are some issues with the event editor, both that I can't consistently reproduce but happen often. One is when opening/closing groups via the +/- the currently highlighted event sometimes moves to the location of the group.

Bug#2 is sometimes trying to click an event near the top of the screen when working on events in a group results in the entire group of events getting selected, even if I'm clicking on an action.