<p>I finally found the bug report which I thought was related:</p>
<p><a href="https://github.com/geany/geany/issues/1428" class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="214166640" data-permission-text="Issue title is private" data-url="https://github.com/geany/geany/issues/1428">#1428</a></p>
<p>There's a window with one tab with Geany editor and one with the Preferences window created by Mac OS. And in this bug report I think there's just the editor tab displayed by Mac OS for some reason.</p>
<p>(And the Mac OS expert in the bug report wasn't <a href="https://github.com/codebrainz" class="user-mention">@codebrainz</a> but <a href="https://github.com/elextr" class="user-mention">@elextr</a> ;-)</p>
<p><a href="https://github.com/codebrainz" class="user-mention">@codebrainz</a> The problem is that it involves Objective-C which we don't use in the code at the moment and from what I remember Colomban wasn't very keen of using it (which then complicates build settings and requires linking objective-c runtime).</p>
<p><a href="https://github.com/nimdanor" class="user-mention">@nimdanor</a> Yeah, I suspected that, I think it's really a tab. Isn't it possible to close it? There might appear a close button when you move the mouse to the left of the second "title bar".</p>

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