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Does anyone else see the following strange behaviour in the Maple 11 plot engine?

I was acting in a Std GUI Worksheet, not a Document. (I use Maple for 64bit Linux, which may or may not matter.)

1) In this next plot below, a (superfluous?) solid triangle appears. It lies in a xz-parallel plane at y=-1, with vertices (0.0,0.0,0.0), (1.0,-1.0,0.4), and (1.0,-1.0,0.0).

plot3d(sqrt(1-y^2),x=1..2,y=-1..1,colour=red,filled=true,view=[-0..2,-1..1,0..1]);

2) If I left-click on the plot, I can rotate it. OK. But if the very next mouse action is to left-click-sweep to select part or all of the plot3d command itself, then as the command is gradually selected the plot continues to rotate. That might be an oversight in the GUI.

acer
plot

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