Devin J. Pohly 831fc36bc9 Make drag_icon a persistent scene node ...

If there is no current drag icon, this node will be empty, but we now
have `drag_icon != NULL` as an invariant.  This allows us to eliminate a
conditional, since there's no harm in moving an empty node's coordinates
around with the pointer.

ΔSLOC: -1

2023-07-13 22:17:03 -06:00

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