Toolbar button status on touch devices

[Mark Wade]

Steps to reproduce

Using a touch device (tested on an iPhone):

1. Go to ​http://ckeditor.com/demo
2. In the demo, highlight a word and click the italic button on the toolbar to italicised it
3. Click elsewhere in the editor to move your cursor onto a word which is not italicised

Expected result

The italic button returns to a non-highlighted state

Actual result

The italic button remains highlighted

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

Tested on Safari in iOS 10.1 (14B72) on an iPhone SE.

[kkrzton]

This is a duplicate of #16761. This ticket was reported earlier than #16761, however there is some discussion already there so I am closing this one.