Slightly related to #20026, i.e. changing default colors for a small part
of Sage:
Could we have a specific trac keyword for user-visible changes? Then we
could make a semi-automatic "What's new in version X" better. Anything
that deprecates something should always have that keyword set. But not
only them, also those tickets that change some default value.
As an example, some versions ago .plot() for poset gave the picture
upside-down with dot2tex installed. Ticket correcting that would have the
keyword set.
(Warning: Got the idea 15 minutes ago. Can be a very bad idea.)
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Jori Mäntysalo