[PythonCAD] _width, _height?

[Russ Nelson]

In Interface/Gtk/gtkedit.py/select_motion_notify, _width and _height
are set but not used.

Other than that, it's the same code as in gtkmirror.py/select_motion_notify,
which is the same code as in gtkmodify.py/select_motion_notify.

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