Infinite loop with malformed select tag

[mattleff]

Steps to reproduce:

1. Enter the HTML in Source:

<form>
		<table>
			<tbody>
				<tr>
					<td>
						<select name="StartDateYear" size="1">
							<option selected="selected" value="">SELECT</option>
							<option value="2012">2012</option>
						</select>
							<option value="2012">2013</option>
						</select>
							<option value="2012">2014</option>
						</select>
					</td>
				</tr>
			</tbody>
		</table>
</form>

2. Click Source to leave source mode.

Actual result:

Infinite loop...

[j.swiderski]

Reproducible in all browsers from CKEditor 3.0.

Does not occur in normal page with body set to contenteditable.