Comment 80 for bug 66104

Some more information about the infinite loop: It looks like

- gtk+ receives a keypress (Ctrl)

- gedit sees the event, and propagates it to the TextView,
  which calls XFilterEvent()

- XFilterEvent() forwards the event to scim and returns FALSE.

- A fabricated event then arrives from scim

- gedit sends this to XFilterEvent()

- xim ignores this event, since it knows that it was fabricated

- gedit then sends the event once again to XFilterEvent()

- xim doesn't think this one is fabricated, so it forwards it to scim

- a fabricated event arrives, and gedit once again filters it twice.

So the root of the infinite loop bug is that gedit calls XFilterEvent() twice
for a single event. Or maybe the root cause is that XIM thinks generating events
behind the application's back is not stupid.