Hi Hendrik,

Hendrik Rommeswinkel <rommeswi@ntu.edu.tw> writes:

> Using \left(\right) without a space before \left( breaks the syntax
> highlighting. The remainder of the document is shown in yellow but
> sometimes editing b e l o w the \left(\right) will make syntax
> highlighting work again.

I can't reproduce what you're describing.  It looks like this for me: