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

>
>
> On Tue, Mar 3, 2015 at 3:44 PM, David Nalesnik <david.nales...@gmail.com>
> wrote:
>
>> Harm,
>>
>> On Tue, Mar 3, 2015 at 3:30 PM, Thomas Morley <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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