Select all, replace text loses formatting on firefox

[zacaway]

Using current standard CKEditor demo:

1. Select all the content in the demo editor and delete it.
2. Enter some text (e.g. "original").
3. Press Ctrl-A (or Cmd-A on Mac) to select all the text.
4. Hit the Bold button to bold the text.
5. Press Ctrl-A again to re-select all (even if it is already selected).
6. Type in some new text (e.g. "new"), which will replace the original text.

On Chrome and Safari, the new text is bold (i.e. it retains the styling of the original text). On Firefox and IE11, the new text does not retain the original styling; it just gets the default styling.

I think the Chrome and Safari behaviour is correct, so Firefox and IE11 should work the same way.

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Related issues: #11162, #8439, #8440.

[Piotrek Koszuliński]

This is caused by differences between browsers.