So, I've been using hide-ifdef-mode for C/C++ code.
For example, do M-x hide-ifdef-mode and M-x hide-ifdefs and
you see stuff like
#ifdef DEBUG ...
I'd like to see a few enhancements, for example, the '...' should be
mousable. If you click on the ... you see the code.
Also, the ifdef symbol could be mousable, and if clicked on could pop
up a menu to define or undefine the symbol.
I couldn't figure out where the ... was coming from, I guess it
is coming from 'selective-display-ellipses' in redisplay.c
How would I go about making this change?