<p>I think this is a reasonable enhancement request that could be mostly implemented with not too much work. The three areas as I see it are:</p>
<ul>
<li>
<p>GTK theme: You can request to be put in "dark mode" like in <a href="https://github.com/b4n/geany-plugin-dark-theme/blob/25fa14a97c2c1f1b1a2d7da3e33cf1bb25978017/dark-theme.c#L35">@b4n's plugin</a> which is just a few lines of code.</p>
</li>
<li>
<p>Scintilla theme: Not counting actual dark themes, this could be done simply using the existing "invert syntax highlighting colors" functionality.</p>
</li>
<li>
<p>VTE theme: I guess this would be similarly invert the foreground and background colours using the libvte API.</p>
</li>
</ul>
<p>Due to above, re-opening and labeling as an enhancement.</p>

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