<p>I guess this will fix it, doesn't it?<br>
diff --git a/geanylatex/src/latexstructure.c b/geanylatex/src/latexstructure.c</p>

<pre><code>index b06a9d2..f16cd38 100644
--- a/geanylatex/src/latexstructure.c
+++ b/geanylatex/src/latexstructure.c
@@ -94,11 +94,10 @@ void glatex_structure_lvlup(void)
                        haystack = NULL;
                        sci_replace_sel(doc->editor->sci, tmp);
                        g_free(tmp);
-                       sci_end_undo_action(doc->editor->sci);
                        break;
                }
        }
-
+       sci_end_undo_action(doc->editor->sci);
        if (haystack != NULL)
                g_string_free(haystack, TRUE);
 }

</code></pre>

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