The current use cases in Gecko are, in addition to the above:
1) Allowing browser extensions to decide whether to listen to all events
or only trusted ones; whatever their reasons for it.
2) Only allowing middle-mouse paste into an editor if the middle-click
event is trusted.
3) Some XForms stuff I'm not familiar with.
4) Some XBL stuff.
5) Text input and textarea only respond to trusted events (not sure why;
would need to dig in the CVS history).
6) Anchor default actions (showing text in the status bar and following
the link) only happen for trusted events; I believe the status bar
part was why this was done...
7) Untrusted events do not put the popup blocker into the "user actually
did something like clicking a button, which means he may want a new
window" mode.
My one problem with these, is that they're all User Agent reasons for
wanting it, very good ones, none of them provide reasons for exposing it
outside of the user agent, which is what we're doing here, I assume some of
the XBL stuff is doing it.
As you've shown though Mozilla has a viable model for it, so I'm pretty
happy with adding it.
Cheers,
Jim.
