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seaborn styles make "+", "x" markers invisible; proposed workaround for shipped styles #8351
Description
It is a somewhat well-known issue (#4679) that seaborn's styles make "+", "x" markers invisible by default (because they set lines.markeredgewidth to zero). Although it may be helpful to use a separate rcparam to control such markers, this is not trivial (see linked issue). Instead, in this issue, I'd like to argue that matplotlib should not ship styles available by default where some markers are completely invisible; instead, we may e.g. set lines.markeredgewidth to a tiny value, so that the markers are at least faintly visible (and it may be easier to realize where the issue comes from), even though it is not strictly equivalent to the "official" seaborn style.
From simple attempts, it seems that a value like 0.25 should be enough.
Activity
mwaskom commentedon May 31, 2017
I think this can be handled once #8479 lands by setting
markeredgecolorto"auto", as per de7bc93, and then setting marker edge widths to any reasonable nonzero value.dmcooke commentedon Jan 21, 2022
Just hit this bug. Took me a while to figure out why my '+' marker wasn't showing (I'm using the seaborn-notebook style).
mwaskom commentedon Jan 21, 2022
This is looong since fixed in seaborn itself, but unfortunately matplotlib refuses to fix the style sheets they ship: #13680
anntzer commentedon Jan 29, 2022
I think this is effectively closed by #22317 (the old styles will stay what they are given the backcompat concerns, but they point to seaborn itself).