Page is scrolling down when I click on any panel element

[Alex]

Steps to reproduce ¶

1. Go to ​http://ckeditor.com/demo#full-page
2. Scroll page, so that editor appear in bottom of the screen.
3. In editor, click "Source", delete all HTML content and Copy&Paste new content from here: ​http://pastebin.com/raw/U0QHSidz
4. Сlick "Source" to switch from source mode to visual.
5. Click any panel element, for example "B" (Bold) button.

Expected result ¶

Page is not scrolled.

Actual result ¶

Page is scrolled down.

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

If content have many lines, then page is scrolled very far. I have usual Chromium browser 49.0.2623.108

[Alex]

test content for editor

[Jakub Ś]

Problem can be reproduced from CKEditor 4.4.6 in Blink browsers. It looks to me that the bigger the content, the bigger the scroll is, just as if CKEdiotr was trying to scroll page so that middle of that content.