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The textarea leaves its glyphs transparent so the syntax-highlight layer can paint them. Its selection background covers that layer, which made selected code unreadable without a separate foreground color.
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Summary
Selected text in the interview editor was unable to read because the textarea keeps its text transparent while the selection background covers the syntax-highlight layer underneath.
Set a foreground color for selected text so it remains visible while preserving the existing overlay-based syntax highlighting.
Sample
Before:

After:

Summary by cubic
Fixes selected text in the interview editor being unreadable by adding a foreground color to
#editor::selection. The textarea glyphs stay transparent for the syntax-highlight overlay, but the selection background was covering that layer; now selected text uses the ink color and remains visible.Written for commit d9221e4. Summary will update on new commits.