IE9 After selecting text right to left inside p before br causes styling to not work.

[Joel]

When the editor content is like <p>foo<br/>bar</p> and the user selects "foo" with mouse or keyboard from right to left and tries to add bold style to the text, it fails (selection dissappears and no styling).

When re-selecting foo right to left elementspath displays "body p strong" - but when switching to source there is only the p and br elements. Selecting by double clicking and then applying a style works.

Reproduced in ​http://ckeditor.com/demo and in ​http://nightly-v4.ckeditor.com/3627/samples/replacebyclass.html

This might be a symptom of a known issue like the one that depends on how browsers handle the caret positioning but I didn't find a ticket and I guess it could still be concidered a bug?

[Jakub Ś]

DUP of #9452.