<p>Geany can be built for GTK2 or GTK3, just not both at once in the one executable, although if built with different prefixes you could have both available.</p>
<p>The GTK3 icon size is taken from the system theme, so blame whoever set the theme you use.  Oh wait, that would be you (even if by default :-)   On my Linux Mint there is a cheery dialog that lets me set the icon theme.  I expect Slackware has something similar.</p>
<p>You can also set Geany specific overrides in the geany.css in your config directory.</p>

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