The editor shouldn't stop highlighting as soon as it finds a highlighted line

[marijnh]

The line's meaning might have changed because of changes above it (think adding a quote, causing the next line to be string).

[mishoo]

I thought of a similar optimization for Ymacs but never did it as it seemed too tricky. (not just adding a quote, let's say we could catch that event, but pasting some code that contains, say, unbalanced quotes or comment markers; not to say it could break indentation for the following lines).

On the other hand, it might be a pretty good compromise in general.

[marijnh]

This was done in a3a607c