bug#49534: [External] : Re: bug#49534: 26.3; Isearch should support using filter predicates with empty search hits

[Drew Adams]

> > I'm in no way arguing that your fix is in some
> > way incorrect or insufficient.  I'm just trying
> > to understand the code here.  I'd appreciate this; thx.
> 
> If I designed a new function from scratch then I could explain all
> decisions made while implementing it.  But I only fixed a few places
> in the existing function just to pass test cases that you reported.

Understood.  But you must at least understand why
you made the changes you made.  That's what I'm
asking about - those particular changes.