<p>It happens on my system as well:<br>
ArchLinux<br>
Xfce 4.14<br>
Geany 1.36 (git >= <a class="commit-link" data-hovercard-type="commit" data-hovercard-url="https://github.com/geany/geany/commit/c88c27e2d22dbff72488d8a57a825830fb833682/hovercard" href="https://github.com/geany/geany/commit/c88c27e2d22dbff72488d8a57a825830fb833682"><tt>c88c27e</tt></a>), en_US.utf8<br>
GTK 2.24.32, GLib 2.60.6<br>
Font: DejaVu Sans Mono Book<br>
Size: 8</p>
<p>As mentioned in <a class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="206040057" data-permission-text="Issue title is private" data-url="https://github.com/geany/geany/issues/1387" data-hovercard-type="issue" data-hovercard-url="/geany/geany/issues/1387/hovercard" href="https://github.com/geany/geany/issues/1387">#1387</a>, changing font size makes the underscore visible (though there no usable font size where it appears).</p>
<p>The same happens with Scite (Version 4.2.0 compiled for GTK 3.24.10).</p>
<p>So I think this might be an issue either with the DejaVu Sans font or with Scintilla.</p>

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