Mouse actions on CKEditor scrollbar throws 'p.getAscendant is not a function'

[kdambrauskas]

Bug

Mouse events on CKEditor scrollbar results in error 'p.getAscendant is not a function'

Steps to reproduce

1. Make editor scrollable
2. Mouse over scrollbar
3. Profit.

Expected result

No errors

Actual result

Errors

Other details

Clicking the scrollbar also causes an exception.

• Version Chrome 59.0.3071.86 (Official Build) (64-bit)
• OS: Win 10
• CKEditor version: 4.7.0
• Installed CKEditor plugins: Official site http://ckeditor.com/

[jonira]

We have experienced same issue. Can be reproduced in http://ckeditor.com/ demos. Using chrome Version 59.0.3071.86 (Official Build) (64-bit) OS: OS X El Capitan

[mlewand]

I can confirm, it's being thrown by tableselection plugin in https://github.com/ckeditor/ckeditor-dev/blob/621199c/plugins/tableselection/plugin.js#L265

Here's the stack from dev version:

plugin.js:265 Uncaught TypeError: target.getAscendant is not a function
    at CKEDITOR.dom.document.fakeSelectionMouseHandler (plugin.js:265)
    at CKEDITOR.dom.document.listenerFirer (event.js:144)
    at CKEDITOR.dom.document.CKEDITOR.event.fire (event.js:290)
    at HTMLDocument.<anonymous> (domobject.js:46)

[rajeevkhangar]

I am also getting same issue when over cursor on scrollbar. see attachment below.

[mlewand]

@rajeev-khangar your first screen is a different issue #527 that is fixed in 4.7.2 which we're about to release.

The second screen was fixed in 4.7.1, please update your editor and you will no longer experience the issue.