Customizing multi-tab dialog to show only one tab doesn't work

[Damian]

Take the Find dialog as an example. Customize it by hiding the Replace tab and leaving only the Replace tab visible:

replaceTab.hidden=true;
dialogDefinition.dialog.parts.dialog.addClass('cke_single_page'); 

This results in a single Find tab appearing in the dialog, but the tab can be accessed with keyboard and when navigating using arrows, an error occurs and the content of the dialog becomes blank.

[Damian]

I neglected to mention that I do not want to completely remove the Replace tab, i.e.

dialogDefinition.removeContents('replace');

[Alfonso Martínez de Lizarrondo]

I think that the changes of the patch are good, but don't fully address this problem. Even testing the about dialog ​http://ckeditor.com/demo it's possible to get a js error.

1. Open the dialog
2. Press Alt+F10 twice
3. Press Tab -> "O is undefined" (fails in selectPage with null as the id)

So we need to avoid any try to focus the tabs if there's only one. Then this patch will help to recognize the situation for modified dialogs.

I think that the final touch for this patch would be to verify that when hidePage and showPage are called, the 'cke_single_page' class is applied automatically (and whatever else to make it behave as a multitab/no-tabs dialog). That way people can manage the tabs properly through the API without caring about this internal details.

[Garry Yao]

With the above comments revised.

[Garry Yao]

Fixed with [5246].