russell: thuban/Thuban/UI mainwindow.py,1.137,1.138

[Russell Nelson]

Bernhard Herzog writes:
 > Why is this it in view_position_changed?  That method is called for
 > *every* mouse move!  AFAICT, this branch is only executed when the mouse
 > leaves the canvas window, so it's not that often, but the
 > view_position_changed does is not the right place to put this code.

I agree.  I wanted 1) to have this change in the code, and 2) to have
it all in one place.  It may very well be that after seeing how it
works, somebody figures out what we REALLY want to be telling the
user, and where and how and when.

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