span tag replaced by font

[LeResKP]

Steps to reproduce

1. Go here ​http://sdk.ckeditor.com/samples/acf.html in section 'Adjusting Automatic ACF Mode'
2. Select the text in green 'text colors' and click on backspace
3. Type a new text

Expected result

Only the new text should be added

Actual result

A font tag with the previous color is added

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

Linux Fedora, chrome Version 40.0.2214.115 (64-bit). I also saw the bug on windows chrome and firefox

[LeResKP]

font tag is added

[Jakub Ś]

This issue looks like a part of #13830 where many similar issues are mentioned.

[kkrzton]

I also encountered same/similar issue but it is only reproducible on IE/Edge:

1. Go to ​http://sdk.ckeditor.com/samples/acf.html to Disabling ACF sample.
2. In the source mode paste HTML

<p><span style="font-size:18px;color:#00FF00;background-color: #FFFF00">Text</span></p>

3. Switch back to WYSIWYG mode.
4. Select whole Text.
5. Type something.

Resulted html is:

<p><font color="#00ff00" style="background-color: rgb(255, 255, 0);">Typed text</font></p>

So the span tag was replaced by font tag.

[kkrzton]

It seems like the scenario described in a previous comment fits better for issue #13775. Both issues seems to be related.