Problem: On a graph, the opposite line of an axes don't change when basepathattrs are changed on a graph.axis.painter. This is unlikely what most users would like, as for instance it causes different sides of the graph to have different line attributes (if a user increases line width of the axes, he/she expects the same to be done, by default, on the other side of the graph).
the attributes of axies.painter are not passed to axis.linkpainter in creation of axis. In particular, the class _regularaxis initializes as
def init(self, min=None, max=None, reverse=0, divisor=None, title=None,
painter=painter.regular(), texter=texter.mixed(), linkpainter=painter.linked(),
density=1, maxworse=2, manualticks=, fallbackrange=None):
causing the painter's attributes not to be passed to the linkpainter, but rather a simple creation of a painter.linked().
Proposal: make some of the attributes of _regularaxis.painter to be passed to _regularaxis.linkpainter during initialization of _regularaxis. This behavior is also found on other programs, e.g. xmgrace.
Discussion: Because not all of the attributes would likely (by most users) be passed to the linked painter (e.g. outerticklength is not so useful if the axes has no labels by default), I propose the following minimal set of attributes to be passed: