API Changes in 2.1.2#
Figure.legend no longer checks for repeated lines to ignore#
matplotlib.figure.Figure.legend used to check if a line had the
same label as an existing legend entry. If it also had the same line color
or marker color legend didn't add a new entry for that line. However, the
list of conditions was incomplete, didn't handle RGB tuples,
didn't handle linewidths or linestyles etc.
This logic did not exist in
axes.Axes.legend. It was included (erroneously)
in Matplotlib 2.1.1 when the legend argument parsing was unified
[#9324](https://github.com/matplotlib/matplotlib/pull/9324). This change
removes that check in
axes.Axes.legend again to restore the old behavior.
This logic has also been dropped from
Figure.legend, where it
was previously undocumented. Repeated
lines with the same label will now each have an entry in the legend. If
you do not want the duplicate entries, don't add a label to the line, or
prepend the label with an underscore.