<p>I think it's actually that Gtk3 makes the small toolbar icon size the same as the menu icon size. AFAIK the menu icon size was always 16x16, and this is what Geany uses for "very small icon" in the preferences, so it must be that the small toolbar icon size used to be 24x24 in Gtk2 and is now also 16x16.</p>
<p>In theory it should be possible to change this by editing Gtk3's <code>settings.ini</code> file like:</p>
<div class="highlight highlight-source-ini"><pre><span class="pl-en">[Settings]</span>
...
<span class="pl-k">gtk-icon-sizes</span>=<span class="pl-k">gtk-small-toolbar</span>=24,24</pre></div>
<p>But it doesn't work here.</p>

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