[antlr-interest] ANTLRWorks editor slow down

[Peter Boughton]

Not sure if this helps, but I just view-sourced a gmail page and
dumped it into a fresh AW session, effectively producing an 800 line
nonsense grammar.

This caused AW to go incredibly sluggish, typing takiing ages, with
the process hogging a whole CPU core, until I killed it. No
significant memory increase though.

(This is on Win XP with Java 1.6)