<p>Adding this as a comment, for anyone similarly affected.</p>
<p>Geany was using ~20% CPU, constantly and consistently when idle -- when launched from the XFCE "Whiskers" menu (which is the way I normally start it), but NOT from terminal (e/g/ xfce4-terminal)!</p>
<p>Solution: edit the Whiskers menu launcher for Geany >> uncheck "Use startup notification."  Geany CPU usage (Geany idle) now 0%.</p>

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