<p></p>
<p>Supposing <em>someone</em> wanted to write a plugin to do what you want...  What do you mean by:</p>
<blockquote>
<p>... with an appropriate marker...</p>
</blockquote>
<p>If you want to check the color of a value, Geany has a color chooser.  There is also a "Send Selection to" command.  There might be an external program that could display the colors you send it.</p>

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