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Reports usages of <code>JBColor.namedColor()</code> with unregistered key.
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  All keys must be registered with corresponding metadata in <code>*.themeMetadata.json</code>.
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  Quick-fix offers navigation to all known <code>*.themeMetadata.json</code> candidate files to add necessary entry.
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  See <a href="https://plugins.jetbrains.com/docs/intellij/themes-metadata.html">Exposing Theme Metadata</a> in SDK Docs for more
  information.
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