bad matching in "Notehead" in note properties

In r2935 (first reported by Forumus )

Select a note
Right click on it -> Note properties
Select Slash notehead type

Expected result : The notehead should change to slash.
Actual result : the notehead is a triangle (s1mi notehead)

Discussion: I don't understand why but apparently the NoteHeadType enum is not in the "natural" order. If you check the notehead palette, you will see that s1mi appears before slash but the enum is :
enum NoteHeadGroup {
HEAD_NORMAL, HEAD_CROSS, HEAD_DIAMOND, HEAD_TRIANGLE,
HEAD_SLASH, HEAD_XCIRCLE, HEAD_DO, HEAD_RE, HEAD_MI, HEAD_FA, HEAD_LA, HEAD_TI,
HEAD_GROUPS
};

I though the order of enum was respected?

A quick and dirty fix could be to change the order in chordproperties.ui but I would like to understand the enum stuff.