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I have run into a strange behavior from the Merge Shapes
command (26.0 on Ubuntu).
Trying to merge a few MET layer features, and catching
an instance by mistake as well, when I do the Merge all
of the selected MET shapes disappear and a cryptic error
This behavior also happens in Windows 0.26.1 release,
only slight difference in the appearance of the error popup.
An "Undo" recovers the polygons, but it's still a bit creepy.
Seems to me that instances should simply be ignored from
the "input set" as they are not "Shapes"?
The selected set:
The result (yikes!)