Hi elcuco, I came here just to see your code.
I download-it, and make a test (I sugest you to do the same):
Run 'new-editor';
Than open a big CPP file, in my case "$QTDIR/src/gui/widgets/qtextedit.cpp";

Whats happen is that 'new-editor' loads the file very quick but it doesn't do the highlight and freezes the entire application.

I think you'll like to know