[iOS] CKEditor content area scrolls up when cursor is placed at the beginning of line

[Jakub Ś]

Steps to reproduce

1. Open CKEditor4 sample page on iPad, Safari. The editor should contain a lot of text so that it is scrollable.
2. Place cursor at the beginning of the text to input new characters (virtual keyboard should appear)

NOTE: New text doesn’t have to be input at the beginning of editor’s content. Placing the cursor at the beginning of any line moves the editor’s body too.

Expected result

Virtual keyboard appears. Editor’s body is not moved (page is not scrolled). Input characters are visible on screen.

Actual result

Virtual keyboard appears. Editor’s body is shifted up (whole page is scrolled down) and the beginning of its content is not visible on screen. Typing on the virtual keyboard inputs new characters however they cannot be seen because the page is scrolled down.

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

Problem has been checked in CKEditor 4.6.2, iOS 10.2.1, Safari 10.0