Issue 1766 in lilypond: Checks for grobs with circular parentage in the regtests

[lilypond]

Status: New
Owner: address@hidden
Labels: Type-Defect Priority-Medium

New issue 1766 by address@hidden: Checks for grobs with circular  
parentage in the regtests
http://code.google.com/p/lilypond/issues/detail?id=1766

Message:
This gets rid of all circular parentage in LilyPond (at least all that's
in the regtests...).

Description:
Checks for grobs with circular parentage in the regtests.

Eliminates all circular parenting cases from the code base, allowing
for null pointers to be parents but issuing a programming error (this
should only happen for staves that will never see the light of day due
to bad code).

Please review this at http://codereview.appspot.com/4747045/

Affected files:
   M lily/dynamic-align-engraver.cc
   M lily/grob.cc
   M lily/include/grob.hh
   M lily/include/main.hh
   M lily/pitched-trill-engraver.cc
   M lily/program-option-scheme.cc
   M make/lilypond-vars.make
   M make/lysdoc-targets.make