<p><b>@ntrel</b> commented on this pull request.</p>

<hr>

<p>In <a href="https://github.com/geany/geany/pull/2270#discussion_r319160752">src/build.c</a>:</p>
<pre style='color:#555'>> @@ -2577,15 +2565,20 @@ void build_save_menu(GKeyFile *config, gpointer ptr, GeanyBuildSource src)
                                g_key_file_remove_key(config, build_grp_name, "error_regex", NULL);
                        if (pj->priv->build_filetypes_list != NULL)
                        {
-                               data.config = config;
-                               data.ft_names = g_ptr_array_new();
-                               g_ptr_array_foreach(pj->priv->build_filetypes_list, foreach_project_filetype, (gpointer)(&data));
-                               if (data.ft_names->pdata != NULL)
+                               GPtrArray *ft_names = g_ptr_array_new();
+                               guint i;
+                               
+                               foreach_ptr_array(ft, i, pj->priv->build_filetypes_list)
</pre>
<blockquote>
<p>what is the reason we keep invalid documents around? If there is a good reason to do that (like not premature optimization)</p>
</blockquote>
<p>To avoid reading/writing to freed memory. The API allows people to read from a document pointer in a callback without seeing if they can find the document in documents_array. I don't think this can safely be deprecated, it would cause silent breakage.</p>
<blockquote>
<p>but probably located in the document.h file</p>
</blockquote>
<p>It already is.</p>

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