<p><b>@techee</b> commented on this pull request.</p>

<hr>

<p>In <a href="https://github.com/geany/geany-plugins/pull/927#discussion_r334291323">treebrowser/src/treebrowser.c</a>:</p>
<pre style='color:#555'>>  
        ctype = g_content_type_guess(path, NULL, 0, NULL);
        icon = g_content_type_get_icon(ctype);
        g_free(ctype);
 
        if (icon != NULL)
        {
-               gtk_icon_size_lookup(GTK_ICON_SIZE_MENU, &width, NULL);
-               info = gtk_icon_theme_lookup_by_gicon(gtk_icon_theme_get_default(), icon, width, GTK_ICON_LOOKUP_USE_BUILTIN);
-               g_object_unref(icon);
+               info = gtk_icon_theme_lookup_by_gicon(gtk_icon_theme_get_default(), icon, 16, 0);
</pre>
<p>Notice that the constant GTK_ICON_LOOKUP_USE_BUILTIN  was used for the last parameter which is flags - I believe this is why the icons looked differently on macOS so I used 0.</p>
<p>The width was determined by <a href="https://developer.gnome.org/gtk3/stable/gtk3-Themeable-Stock-Images.html#gtk-icon-size-lookup" rel="nofollow">https://developer.gnome.org/gtk3/stable/gtk3-Themeable-Stock-Images.html#gtk-icon-size-lookup</a> but based on the documentation this function shouldn't be needed and GTK_ICON_SIZE_MENU is 16px. I use the same in ProjectOrganizer and it seems to work fine.</p>

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