Using insertHtml within a formatted span tag splits it into two and inserted HTML doesn't get formatted

[adsharp]

Browser: Safari, Firefox OS: Max OS X 10.7.2

To reproduce:

1. Start with an empty CKEditor instance
2. Type in some text
3. Format the text as Arial 12px
4. Move the cursor somewhere in the middle
5. Call CKEditor.instances.editor.insertHtml("<b>Hello, world</b>")

Result:

<span style="font-size: 12px;"><span style="font-family: arial,helvetica,sans-serif;">This is </span></span>
<b>Hello, world</b> <!-- span was split in two and this inserted between -->
<span style="font-size:12px;"><span style="font-family: arial,helvetica,sans-serif;"> some text</span></span>

[Jakub Ś]

This is how insertHTML works. I CKEditor had modified inserted HTML that would be a real bug.

For that you should rather use PasteAsPlainText plugin or CKEDITOR.instances.editor1.insertText("Hello, world");

There is a little problem with this option however - I have reported it here #8722.