Flash Player's spurious input events

[kjarosh]

It's a TODO from #5443.

Flash Player sometimes generates spurious input events (i.e. events that did not happen in reality). This is very common in case of Tab, when pressing Tab once produces two key presses. This behavior is deterministic and for some SWFs it even makes some text fields unfocusable by tab.

In case of Tab, it happens most often once at the beginning and then disappears, I can recall it also happened for other input events.

If we ever decide and manage to match this behavior, it should probably be configurable.

SWFs that are known to be affected by this behavior:

• quadradius_lobby.swf — you cannot focus the first field