fix: Reset current ansi terminal color #11962
Merged
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Fixes #11940
Proposed changes
An empty ansi terminal sequence must be handled as an explicit reset.
This could cause that foreground colors were applied when black was to be used.
Adjust overridden colors for range-diff.
contextBold should not be reverse bold and
newDimmed/oldDimmed should be reverse.
(There is a minimal difference bold/normal black, but this context is
not very interesting.)
Screenshots
Slightly different behavior in 5.0 and master
Use mstv's branches repro/rangediff2-a and repro/rangediff2-b
5.0

master

after

Test methodology
Tests are updated
Merge strategy
I agree that the maintainer squash merge this PR (if the commit message is clear).
✒️ I contribute this code under The Developer Certificate of Origin.