<p></p>
<p>The autocomplete popup is created by the Scintilla editing widget and it uses <code>gtk_menu_popup_at_widget()</code> on any GTK > 3.22 see <a href="https://github.com/geany/geany/blob/b524a58e12e85c94a32f64fb72615978b2628af1/scintilla/gtk/PlatGTK.cxx#L1927">here</a></p>

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