handlerpageedit: Retain comment when clicking preview

template/quitesimple/page_creation_preview

@@ -8,10 +8,10 @@ This is a preview of your changes:<br>
 <button type="submit" name="do" value="preview">Preview</button>
 <textarea name="content" style="width: 100%;" rows=70>{qswiki:var:content}</textarea>
 <br><b>Comment:</b><br>
-<input type="text" name="comment" size=50><br>
+<input type="text" name="comment" size="50" value="{qswiki:var:comment}"/><br>
 <input type="hidden" name="csrf_token" value="{qswiki:var:csrf_token}"></input>
 <button type="submit" name="do" value="submit">Submit</button>
 <button type="submit" name="do" value="preview">Preview</button>
 </form>
 </main>
-{qswiki:include:general_footer}
+{qswiki:include:general_footer}