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Plane command misbehavior
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Entering command Plane[z=0] works the same whatever view have focus (2D, 3D, table, CAS)
Plane[x=0] only works when the 3D view have focus. An error is reported otherwise which does not mimic the mathematically behavior.
Workarounds
 use x+0 z=0
 always focus on 3D view first
Suggestion:
When command Plane receives as argument a line from the xy plane, it should return the plane containing that line and orthogonal to the xy plane.
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Thanks, Plane[x=0] fixed for next release.
Note that for a line defined previously a:x=0 the command Plane[a] will still fail.
(Also fixed Plane[x^2+y^2=1] which was giving an error, athough in most cases Plane[conic] makes sense only for conics outside the z=0 plane)
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