Deleting columns with merged cells results in columns being left behind.

[Jakub Ś]

Steps to reproduce

1. Create 4x4 table and fill each column with same number 1 2 3 4
2. In second row merge cell 2 & 3. Alternatively you can use source code below.

   <table border="1" cellpadding="1" cellspacing="1" style="width:500px">
   	<tbody>
   		<tr>
   			<td>1</td>
   			<td>2</td>
   			<td>3</td>
   			<td>4</td>
   		</tr>
   		<tr>
   			<td>1</td>
   			<td colspan="2" rowspan="1">23</td>
   			<td>4</td>
   		</tr>
   		<tr>
   			<td>1</td>
   			<td>2</td>
   			<td>3</td>
   			<td>4</td>
   		</tr>
   		<tr>
   			<td>1</td>
   			<td>2</td>
   			<td>3</td>
   			<td>4</td>
   		</tr>
   	</tbody>
   </table>
   

3. Select merged cell 23 and cell 4 next to it.
4. Right-Click, Select Column-> Delete Columns.

Expected result

All 3 columns get deleted.

Actual result

Column 3 & 4 gets deleted but Column 2 stays. If you try the same with non-merged cells, all three columns get deleted.

Other details (browser, OS, CKEditor version, installed plugins)

Problem can be reproduced in every browser at least from CKEditor 4.0