Can not keep the <font>tag when saving

[topliu88]

Are you reporting a feature request or a bug?

Bug

Check if the issue is already reported

No

Provide detailed reproduction steps (if any)

1. Set config to:

config.fontSize_sizes = '1/1;2/2;3/3;4/4;5/5;6/6;7/7;';

config.font_style = {
	element: 'font',
	attributes: {'face': '#(family)'},
	overrides: [{
		element: 'font', attributes: {'face': null}
	}]
};
config.fontSize_style = {
	element: 'font',
	attributes: {'size': '#(size)'},
	overrides: [{
		element: 'font', attributes: {'size': null}
	}]
};

config.extraAllowedContent = 'font[*]';

2. Set font size to 4 for a string.
3. Saving the form, the CKEditor.getdata() will wrongly convert "font" to "span".

Expected result

The "font" tags are kept.

Actual result

"font" tags were wrongly converted to "span"

Other details

Till CKEditor 4.5.11 this config works fine.

• Browser: All
• OS: All
• CKEditor version: 4.6.0
• Installed CKEditor plugins: font

[f1ames]

Can be reproduced here: https://codepen.io/f1ames/pen/goYxgz