diffLines never returning

[maziac]

Hi,

there seems to be a problem with big files/diffences.
I have here 2 files that differ very much.
1 file is 1 line only the other file is about 13000 lines.

In that case diffLines never returns.

I attached a project to reproduce.
textC is the long text.
If instead of textC the short textB is used everything works fine, but with textB diffLines never exits.

jsdiffproblem.zip

[ExplodingCabbage]

This takes a fraction of a second now, probably due to #448.