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Demo: Fix/unfix pan/zoom with scripting

Author:
Michael Borcherds
To fix zoom: SetValue[a,CopyFreeObject(x(Corner(1)))] SetValue[b,CopyFreeObject(y(Corner(1)))] SetValue[c,CopyFreeObject(x(Corner(3)))] SetValue[d,CopyFreeObject(y(Corner(3)))] ZoomIn(a,b,c,d) and to unfix again: ZoomIn(0,0,0,0)

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