Tim Hoffmann

We have both - colormaps in the ColorMapRegistry `mpl.colormaps` / `plt.colormaps`: mapping a numeric interval [0, 1] to colors. - color sequences in the ColorSequenceRegistry `mpl.color_sequences` / `plt.color_sequences`: named lists...

> Errors should never pass silently, yet there is no feedback to the user that his or her color assignment via set_facecolor isn't doing anything. Indeed. This should issue a...

As a general remark: The buttons are placed above the text:  I believe the more common placement text next to the buttons:  This would also have the advantage...

You could still place equidistantly with text right of the buttons. The possible overlap issues are the same, except that you have a constant reserved space for the buttons.

This would be a reasonable feature. PRs welcome.

It should be fairly simple to create `axhalfspace()` inspired by `axline()`. The latter has most of the API and logic in place. You just have to define whether to fill...

High-level feedback: - correct: `PolyCollection` itself does not have the capability to provide a high-level interface for manipulating `fill_between` results after creation. - correct: Subclassing `PolyCollection` is one approach to...

> * > Would it make more sense to create semantic containers that provide the high-level interfaces and contain the geometric artists? (-> favor composition over inheritance) > > Could...

> I'm not sure this really is a paradigm shift. We have other compound artists, `Line2D` being the most obvious. One can count Line2D in that direction, but it's still...

Sorry, I'm out of review capacity for at least one more week. Will look into this afterwards. Please ping again if nothing has happened in the next two weeks.