Fix a bad style in CodeMirror.

Review Request #14669 — Created Nov. 5, 2025 and updated

Information

Review Board
release-7.1.x

Reviewers

We had a weird, single style rule for .cm-header that just specified
the color as "black". This made markdown header lines (such as those
starting with #) very hard to read when running in dark mode.

This change gets rid of that.

Edited a change description that had header lines and was able to read
the text.

Summary ID
Fix a bad style in CodeMirror.
We had a weird, single style rule for `.cm-header` that just specified the color as "black". This made markdown header lines (such as those starting with `#`) very hard to read when running in dark mode. This change gets rid of that. Testing Done: Edited a change description that had header lines and was able to read the text.
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Checks run (2 succeeded)
flake8 passed.
JSHint passed.