Re: Core dump on system-initial grace note with proportional notation

[David Kastrup]

Trevor Bača <address@hidden> writes:

> Hi,
>
> I've found a reproducible core dump related to grace music.
>
> Here's a minimal example. Explanation appears after:
>
> ### BEGIN EXAMPLE 1 (CORE DUMP) ###
>
> \version "2.19.46"
>
> \new Score \with {
>     \override SpacingSpanner.strict-grace-spacing = ##t
>     \override SpacingSpanner.strict-note-spacing = ##t
>     \override SpacingSpanner.uniform-stretching = ##t
>     proportionalNotationDuration = #(ly:make-moment 1 32)
>     tupletFullLength = ##t
>     } <<
>     \new Staff {
>         c'1
>         \break
>         \grace {
>             c'16
>         }
>         c'1
>     }
>     \new Staff {
>         \times 2/3 {
>             c'2
>             c'2
>             c'2
>         }
>         c'1
>     }
>>>
>
> ### END EXAMPLE 1 (CORE DUMP) ###

Good example.  This is a case of a failed assertion when calling
Interval::center .  Fixing this at the point where the assertion fails
(by just using 0.0 instead) leads to trashy output.  The real problem is
that Tuplet_bracket::calc_x_positions returns a reversed interval.
Apparently it does not deal well with broken brackets in all cases.
There probably is something broken in its logic.

-- 
David Kastrup