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The advantage is that we can now use this struct in the (rather involved)
process of generating a display DerivedMesh and apply modifiers to it.
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When copying mesh data to bmesh the MVERT and similar customdata types
have to be omitted. Otherwise the bmesh instance ends up with NULL
pointers in customdata layers, but entries in the typemap != -1. The
effect was that when storing new steps after one or more undo, the
resulting original data would be copied, and subsequent undo steps
are ignored.
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data masks explicitly.
A dummy mesh is used for strand edit undo storage like in mesh edit
to prevent unnecessary code duplication. However, when copying from/to
BMesh only the mesh data layers are copied by default, omitting the new
data layers for strands (currently only MSurfaceSample hair root data).
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This uses the generalized undo stack system which is also used for
object data edit. An extension is necessary to tell the undo functions
which object is specifically used for generating undo data and
identifying the stack, since strand editing does not edit the obdata
itself.
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