Thank you for your work on this cornerstone lib.

Bug summary

Not a bug, since documented, but still a surprising behavior from plt.style.use('theme') not resetting values to the default before applying the new ones. Apologies if an issue already exist, didn't find one.

This updates the rcParams with the settings from the style. rcParams not defined in the style are kept.

This is especially an issue when using jupyter notebook for example, where one's would cycle through themes before sticking to one they think look good, while it's a mix of multiple themes and dependent of the order in which they've tried it!

Code for reproduction

plt.style.use("seaborn-v0_8-dark")
plt.style.use("dark_background")
# ...

Actual outcome

Mix of both styles.

Expected outcome

equivalent to

plt.style.use("dark_background")
# ...

Additional information

From what I've seen plotting appearance falls under breaking change, but I don't know how strict this is enforced. I'd expect people willingly setting multiple themes at the same time to get a custom style chimera to be quite small.