Joshua Yanovski b4479fe793 Make meshing work properly for rapid changes.
The previous fix accidentally caused meshing to not perform an update if
a chunk was already actively meshing; this change fixes this behavior to
go back to the old behavior.  It also fixes a subtle bug where sprites
would be using old lighting if a chunk was being actively meshed on the
same tick that a sprite change happened (this should only affect things
in a handful of circumstances and could be avoided if, e.g., only color
was changing, but this can be addressed better at another time).
2021-05-18 12:43:38 -07:00
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