<p></p>
<p>The difference with Geany is that it uses the GTK+ Scintilla backend even on Windows, rather than the "native" Win32 Scintilla backend like Notepad++ does, so I don't think it would be possible to use DirectWrite.</p>
<p>Without testing, I'd wager the difference between Linux and Windows is that on Linux you're using a GTK+3 build whereas the official Windows installer uses GTK+2. If you wanted to test that theory you could try building on Linux and passing <code>--disable-gtk3</code> when running the <code>configure</code> script to force a GTK+2 build.</p>

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