Issue 576 in lilypond: TextSpanner 'bound-details 'left-broken syntax problems (e.g. when combined with 'bound-details 'left)

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Issue 576: TextSpanner 'bound-details 'left-broken syntax problems 
(e.g. when combined with 'bound-details 'left)
http://code.google.com/p/lilypond/issues/detail?id=576

Comment #2 by v.villenave:
Further investigations from Trevor:



NR 1.8.3.2 "Text and line spanners" uses the following syntax for 
setting TextSpanner
#'bound-details #'left-broken and TextSpanner #'bound-details #'right-broken:

  \override TextSpanner #'bound-details #'left-broken #'text = "cotinuation"

This sytax does indeed work, as we can see in the following example:

  \new Staff {
     \override TextSpanner #'bound-details #'left-broken #'text = "cotinuation"
     \override TextSpanner #'bound-details #'left #'text = "start"
     c'4 \startTextSpan c'4 c'4 c'4 \break
     c'4 c'4 c'4 c'4 \stopTextSpan
  }


Furthermore, we can see this same syntax working here in this second example:

  \new Staff {
     \override TextSpanner #'bound-details #'left-broken #'X = #30
     \override TextSpanner #'bound-details #'left #'text = "start"
     c'4 \startTextSpan c'4 c'4 c'4 \break
     c'4 c'4 c'4 c'4 \stopTextSpan
  }


But now observe that we get a bug when we try to combine these first 
two examples
together at one time:

  \new Staff {
     \override TextSpanner #'bound-details #'left-broken #'X = #30
     \override TextSpanner #'bound-details #'left-broken #'text = 
"continuation" %
BUG -- this setting junked
     \override TextSpanner #'bound-details #'left #'text = "start"
     c'4 \startTextSpan c'4 c'4 c'4 \break
     c'4 c'4 c'4 c'4 \stopTextSpan
  }


There is a workaround. Setting the alist directly works:

  \new Staff {
     \override TextSpanner #'bound-details #'left-broken =
        #'((X . 30) (text . "continuation"))
     \override TextSpanner #'bound-details #'left #'text = "start"
     c'4 \startTextSpan c'4 c'4 c'4 \break
     c'4 c'4 c'4 c'4 \stopTextSpan
  }


Note that this alist syntax is not available in NR. This syntax is 
available in the
IR ... but with no reference to left-broken and right-broken.

Maybe the best way to summarize this bug is that the code written to 
afford access to
the nested sublists living inside of bound-details breaks when the user 
appends to
the #'left-broken and #'right-broken sublists (but works fine when the 
user appends
to the #'left and #'right sublists).



Issue attribute updates:
	Summary: TextSpanner 'bound-details 'left-broken syntax problems (e.g. 
when combined with 'bound-details 'left)

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