[TxMt] column-typing on thousand-line-long selection dog-slow

[Caio Chassot]

When column typing on a plain-text document with a selection of little 
more than a thousand lines, textmate takes many seconds (almost a 
minute) per char, and makes the entire system unresponsive. (G4 1.0, 
panther).

I understand it's not everyday that you use selections this long, but 
in case it's something relatively trivial to fix and you're so 
inclined... For now it's back to sed I guess.