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My earlier fix for [#33974] (in r.54061) was causing some problems where
manually specified roll values on horizontal or angled bones were getting reset.
This could be nasty as you might not notice the changes for a while (especially
when using stick bones without axes displayed).
I've now put in place a hacky compromise solution which should catch both of
these situations nicely. For z-axis (i.e. vertical) movements, the r.54061 fix
is used, while for everything else (moving or just touch-n-go), the old setting
is used.
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