overlay-arrow-variable-list

I'm still chasing my Holy Grail: the newer Emacs debugger interfaces. I'll soon send in the changes to comint.el that I needed to make some of this stuff work. However, I'm facing another problem where I could use the help of my fellow designers. We support overlay-arrow-position and overlay-arrow-string, which are used by our GDB support to show which line control has reached. The newer Emacs stuff draws multiple overlaid arrows and things to show various bits of information in debugger buffers. To support this, they have introduced overlay-arrow-variable-list, which has the following docstring: List of variables (symbols) which hold markers for overlay arrows. The symbols on this list are examined during redisplay to determine where to display overlay arrows. They modified their redisplay engine to support this list. The newer debugger support uses this variable. I could attempt to modify our redisplay engine to support overlay-arrow-variable-list as well, but that doesn't help. The debugger changes are going to go into packages, so I can't use capabilities that aren't already present in released XEmacsen. What do we have in place that I might be able to use instead? Thanks, -- Jerry James, Assistant Professor james(a)xemacs.org Computer Science Department http://www.cs.usu.edu/~jerry/ Utah State University