why does occur depropertize matching lines?

[Drew Adams]

Don't want to start a holy war. Just a question.

Occur now depropertizes the matching lines it copies to the occur buffer.
Why?

Previously (at least in Emacs 20), this wasn't done, and font-lock
highlighting from the source buffer could often provide visual info in the
occur buffer. For example, with font-lock on in Emacs Lisp mode, it's a lot
easier to see that a line is commented-out by its color than by checking to
see if the line starts with ";".

Imagine several similar lines, some of which are commented out. I wager that
with the depropertized occur buffer you will spend more time clicking and
checking which line is which -- or at least spend more time checking for the
";" at the beginning of a line. If the highlighting is transferred to the
occur buffer, you have a lot more visual feedback to go on.

My 2 cents. I'm sure there are good reasons for the change.

 - Drew