The contour label (clabel) manual mode fails place any labels. When I click the plot I get an error: 'QuadContourSet' object has no attribute 'ax' and no labels are added. I put the Contour Label Demo ...
Currently, ContourSets are not Artists, which causes issues such as #6139 (essentially, the API is not uniform, and they do not appear directly in the draw tree). At a low level, a ContourSet is ...
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