<p><a class="user-mention" data-hovercard-type="user" data-hovercard-url="/hovercards?user_id=6877082" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://github.com/RufusVS">@RufusVS</a>: the open dialog is created in the function <code>create_open_file_dialog()</code>. It calls the function <code>filetypes_create_file_filter()</code> to create the filter and that function is filling the filter with all filetypes from the list <code>filetypes_by_title</code>. This is filled on startup of Geany in the function <code>filetypes_init()</code> which calls <code>filetypes_init_types()</code>. Then first built-in filetypes are set in function <code>init_builtin_filetypes()</code>. And then filetypes are added from the application data directory and the config directory. On my Ubuntu machine these are <code>/usr/local/share/geany/filedefs</code> and <code>/home/username/.config/geany/filedefs</code>.</p>
<p>So, if I understood it right you would have to remove some files from the directory as you did <strong>AND</strong> shorten the list in <code>init_builtin_filetypes()</code>and re-build Geany. Also notice that if you remove some files in the directories it will only have an effect after re-starting Geany.</p>
<p>But as the others wrote the list should be scrollable and it seems to be some kind of Gtk issue.</p>

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