Greying Registers and #defines

[Paul Kroitor]

In puttering about with register presentation and my dream of getting 
GnuCash to grey out reconciled register lines (like Quicken), I've 
noticed that if a read-only boundary is set in File > Properties, all 
the transactions that have become read-only have their background colour 
de-saturated (greyed out).

Furthermore, if I define READONLY_LINES_WITH_CHANGED_FG_COLOR in 
gnucash-sheet-private.c, the foreground text becomes de-saturated too 
(after fixing a couple of minor compile errors that were introduced).

Several questions come to mind:

1. Does anyone remember why two different and possibly co-existing 
mechanisms for identifying read-only transactions were established, of 
which one was implemented and the other apparently scrapped?

2. Is there any reason not to co-opt the disabled foreground 
de-saturation logic for reconciled lines instead?

3. Is there a central place where all these conditional compilation 
directives are documented or discussed (short of doing greps for IFDEFs)?

4. Thoughts about achieving the goal using the above approach vs making 
a whole new CSS class for a reconciled line style?

Thanks as always,

Paul