Dialogs which create popup lose keyboard focus when popup is closed

[mvl22]

If the 'Browse server' button in the image or link dialog is clicked, resulting in the popup window opening, and that popup is then closed, the original dialog no longer has keyboard focus. Accordingly, the escape key does not work.

Reproduce case, using 4.4.3 (revision fd4f17c):

1) Go to ​http://ckeditor.com/demo 2) Click 'Image' button. The image dialog opens. 3) Click 'Browse Server' button. The browse server popup opens. 4) Either choose an image or cancel. The browser server popup closes. 5) There is no keyboard focus any more, and the escape key on the keyboard does not work.

Comparison case:

1) Go to ​http://ckeditor.com/demo 2) Click 'Image' button. The image dialog opens. 3) Press escape, and the image dialog closes.

[Jakub Ś]

Problem can be reproduced from CKEditor 3.0.2 in Blink browsers