Adding a link to an image via toolbar fails if HTML comment is in image's DOM parent chain

[daniel.eric.lee]

Can be reproduced on the CKEditor demo page. 1) Go to http://ckeditor.com/demo 2) Click on 'Source' in the toolbar. Before the opening <h1>, add an HTML comment: <!-- this is a comment --> 3) Click on 'Source' again to toggle back to WYSIWYG mode. 4) Select the Little Red Riding Hood image. 5) On the toolbar, select the 'Link' button 6) Enter text for the link and click OK.

Result: Link Dialog does not close, image is not link-ified, JavaScript error appears in the console:

sibling.is is not a function

... /core/dom/range.js

Line 1032

It appears that range.js's 'enlarge' function is not taking HTML comments into account.

[j.swiderski]

Reproducible form CKEditor 3.5.1.

JS Error:
Message: Object doesn't support this property or method.
Line: 1032
URI: /3.6.1/ckeditor/_source/core/dom/range.js

[j.swiderski]

I was not able to reproduce it in latest CKEditor 3.6.2.
Closing as fixed.