Weak Combining Parts

[Will Oram]

I've got a staff that combines two parts. It alternates between unison 
and unique music for each part. The unique music looks OK. The unison 
bits, though, aren't quite right. One would expect an 'a2' stuck on top 
of one (not two) set of notes. Instead I get two of everything, even if 
they're exactly alike. Two rests, two stems, two beams, etc.

Example below. So is the implementation for this feature not 100% up to 
snuff, an isolated bug, or a feature in disguise?
Also observe the last note in this output (eflat1.). Is a dotted whole 
note near the centre correct placement?

Will

---

\version "2.4.1"

#(set-global-staff-size 13)

\include "english.ly"

partOne = {
        \clef "treble"
        \key d \minor
        \time 6/4
                
        e'1.~
        e4 r r r2.
        r r4 r a,16( bflat c d
        eflat1.\trill)
}

partTwo = {
        \clef "treble"
        \key d \minor
        \time 6/4
        
        g1.\ff~\>
        g4\! r r r2.
        r r4 r a16( bflat c d
        eflat1.\trill)
}



\score {
        \new Staff <<
                \partcombine
                        \relative d'' { \partOne }
                        \relative d'' { \partTwo }
        >>

        \layout { \context { \RemoveEmptyStaffContext } }
}

Will Oram
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