<p></p>
<p>For what it's worth, a quick check with glade 3.8.6 found perfect compliance up to and including GTK 2.16:</p>
<p><a target="_blank" rel="noopener noreferrer" href="https://user-images.githubusercontent.com/59004801/128976372-3f3deb74-211c-4dac-ae10-16c9e857623c.png"><img src="https://user-images.githubusercontent.com/59004801/128976372-3f3deb74-211c-4dac-ae10-16c9e857623c.png" alt="GTK+-2 16-OK" style="max-width:100%;"></a></p>
<p>You have to dial back to 2.14 before anything comes up:</p>
<p><a target="_blank" rel="noopener noreferrer" href="https://user-images.githubusercontent.com/59004801/128977202-a32a419f-c1c6-4161-a7f8-353c2bd4a1dc.png"><img src="https://user-images.githubusercontent.com/59004801/128977202-a32a419f-c1c6-4161-a7f8-353c2bd4a1dc.png" alt="GTK+-2-14-DEPRECATED" style="max-width:100%;"></a></p>
<p>To reproduce:</p>
<ol>
<li>
<p>Fetch a glade-3.8.6 tarball from <a href="https://download.gnome.org/sources/glade3/3.8/" rel="nofollow">here</a></p>
</li>
<li>
<p>Install with:</p>
</li>
</ol>
<pre><code>sudo apt install libgtk2.0-dev libxml2-dev itstool

 ./configure --prefix=/usr/local \
    --enable-debug=yes \
    --enable-maintainer-mode \
    --disable-gtk-doc-html

make -j4 && sudo make install
</code></pre>
<ol start="3">
<li>
<p>Check out <a class="commit-link" data-hovercard-type="commit" data-hovercard-url="https://github.com/geany/geany/commit/90c6096ed6ea167f9100ce8f74229a3f47acc29a/hovercard" href="https://github.com/geany/geany/commit/90c6096ed6ea167f9100ce8f74229a3f47acc29a"><tt>90c6096</tt></a> and open <code>data/geany.glade</code></p>
</li>
<li>
<p>Go to Edit > Preferences and run the validator for toolkit version 2.14 (anything later should pass)</p>
</li>
<li>
<p>Check the diagnostics against this list:   <a href="https://github.com/geany/geany/files/6966154/GTK%2B-2.14.deprecations.log.txt">GTK+-2.14.deprecations.log.txt</a></p>
</li>
</ol>

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