Well, there’s reason enough to redirect this to bug-lilypond, isn’t it? Somehow, Mozilla Thunderbird messes up the code examples, so I can’t do so well. Perhaps the OP’s and Harm’s first mails in the thread, respectively, should suffice for illustration.

~Simon

Am 03.03.2015 um 23:01 schrieb David Nalesnik:


On Tue, Mar 3, 2015 at 3:59 PM, David Nalesnik <david.nales...@gmail.com <mailto:david.nales...@gmail.com>> wrote:



    On Tue, Mar 3, 2015 at 3:44 PM, David Nalesnik
    <david.nales...@gmail.com <mailto:david.nales...@gmail.com>> wrote:

        Harm,

        On Tue, Mar 3, 2015 at 3:30 PM, Thomas Morley
        <thomasmorle...@gmail.com <mailto:thomasmorle...@gmail.com>>
        wrote:


            thanks for testing. So this function may use as a test-case.

            No idea whats causing this bug, though. And because I'm
            not able to
            reproduce it, I can't help furthermore :(


        I don't think I could do anything either.  I wouldn't know how
        to build LilyPond for Windows to verify any fix...


    An observation.  In the following snippet, you'll note in the log
    output  that the default-direction of the downstemmed F and B is
    0--CENTER.  This means that Stem::calc-direction (in lily/stem.cc)
    will take the property 'neutral-direction.  This property is
    supposed to specify the direction of a note on the midline--B only
    in our case.  F should have a default-direction of 1.


Note that adding

\override Stem.neutral-direction = #1

fixes the problem for the bad stems.

David



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