Modify table properties is broken

[Alfonso Martínez de Lizarrondo]

Since [6087] when the table properties dialog is open to edit an existing table, it generates an error when the OK button is pressed.

Load replacebyclass, insert a table, put the cursor on the first cell and using the context menu select "Table properties", then just press OK and there's an error due to the dirChanged event.

[Sa'ar Zac Elias]

Fixed with [6170].