Bug report

In Python 3.6.3 and the related matplotlib (just compiled from sources) the RectangleSelector does no longer behave as in Python 2.7 and as is described. Instead of returning the mouse click coordinates in the event variable eclick and the release coordinates in erelease it returns the lower left corner in eclick and the upper right corner in erelease. This "normalization" reduces the information content and, thus, the usability of the selector. Only using the old version a user can switch to drawmode='line' and use the selector to input a displacement vector.