Colormaps having odd naming when converted internally

[cvanelteren]

Colormaps are converted internally and renamed. This caused a bug in #82 but is recently fixed in main. The issue can be seen from

import ultraplot as plt
for name, cmap in plt.colormaps.items():
    print(f"{cmap.name=} {name=}")
# prints  for example cmap.name='_BR_copy' name='br'

The name of the colormaps if correct, and hence all the functions work correctly. I have the intuition by integration mpl's colormaps and ultraplot's colormaps that this renaming is performed to avoid potential naming collision. I believe this would be unnecessary and is rather confusing.

The relevant code can be found in colors.py

 def _make_name(self, suffix=None):
        """
        Generate a default colormap name. Do not append more than one
        leading underscore or more than one identical suffix.
        """
        name = self.name
        name = name or ""
        if name[:1] != "_":
            name = "_" + name
        suffix = suffix or "copy"
        suffix = "_" + suffix
        if name[-len(suffix) :] != suffix:
            name = name + suffix
        return name

[cvanelteren]

Note that the internal lookup for colormaps ignore cases.

[cvanelteren]

For the user this may never cause an issue unless the explicit cmap.name is used. I don't really know why the maps are internally converted to this plus the suffix, but I think it should be removed.