Style is lost when add another autocomplete suggestion

[KarolDawidziuk]

Type of report

Bug

Provide detailed reproduction steps (if any)

1. Open test: /tests/plugins/autocomplete/manual/outputtemplate#child.
2. Type @ and add one of name.
3. Press space.
4. Repeat 2.

Expected result

• Both of names are bolded.

Actual result

• Only second name is bolded.

Other details

• Browser: IE9
• OS: macOS VBox(win7)
• CKEditor version: 4.16.1

[sculpt0r]

Provided steps creates html:

<strong>@Anna<strong>@Anna</strong></strong>

And those are looking good in modern browsers, but failing in old IE.

~Also, provided steps are not strict scenario steps - so technically the test is not failing. However - it looks like an separate issue.~