bug#29456: [PATCH] Add command for cycling between CSS color formats

[Simen Heggestøyl]

I've updated the patch to support switching between #RGBA/#RRGGBBAA and

rgba() too, fixing a bug in `css--hex-color' along the way for handling

the #RGBA case. If you agree, I think that fix should go into the

emacs-26 branch as well.

I also prefixed the function names with `css--' to more strongly

indicate that they're intended for internal usage, and mentioned in the

docstrings their incompatibility with color.el.

-- Simen

0001-Add-command-for-cycling-between-CSS-color-formats.patch
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