IE11/EDGE: extra SPAN gets added everytime Find dialog identifies the word in the editor

[Irina]

Steps to reproduce

1. Update find_highlight config option to

config.find_highlight = { element : 'span', styles : { 'background-color' : '#004', 'color' : '#fff', 'border' : '1px solid #004' } };

2. Open any CKEditor sample and type some text, e.g. test.
3. Open Find & Replace dialog.
4. Click 'Find' button to search for a word, e.g. test.
5. Click 'Cancel' button.
6. Switch to 'Source' view.

Actual result

A SPAN <span style="border-image: none;"> gets added around the 'test' word.

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

IE11 and MS Edge

[Jakub Ś]

Problem can be reproduced at least from CKEditor 4.3 in IE11+

[Satya Minnekanti]

This is important for IBM, we are adding border to fix Accessibility issues in High Contrast mode. This issue does not occur if you remove border as in nightly build.

[kkrzton]

See ​ckeditor/ckeditor-dev/issues/473.