<blockquote>
<p>I know it's not from this PR, but I wonder why use a macro instead of a typedef for compatibility?</p>
</blockquote>

<p>I don't see a reason, and if it was a typedef we could mark it with <code>GEANY_DEPRECATED_FOR(GeanyFiletypeID)</code>.  We probably should change this right now before a release and people starting to throw in <code>#ifdef filetype_id</code> -- no, I doubt anybody would do that, but still.</p>

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