Previously, these tests would have spurious failures when NO_COLOR or
FORCE_COLOR was set in the user's environment, since we weren't clearing
one variable before testing a value for the other one. The previous
version of the code also did not restore environment variable values on
panic, which could cause spurious failures in other tests after one test
fails.
Fixes: https://github.com/zkat/miette/issues/176
Change the default ansi color theme to use colors that are more similar
to the colors from the default RGB theme. In particular, don't use red
for any of the span labels, since that color is also used for errors.
BREAKING CHANGES:
* the default theme now prefers ANSI colors, even if RGB is supported
* `MietteHandlerOpts::ansi_colors` is removed
* `MietteHandlerOpts::rgb_color` now takes an enum that controls the
color format used when color support is enabled, and has no effect
otherwise.
Expyron
Benjamin Lee
Benjamin Lee