Pressing Enter while having a selection in inline-mode does not delete the range content

[danburzo]

The code that handles inline mode (allowBlockElements=false) assumes that when pressing the Enter key, the range is always collapsed. When it happens not to be, the selected characters are not deleted when inserting the new line.

[danburzo]

Note: It's also now apparent that the check to see if there's content at the right of the cursor fails in both Chrome and Firefox, i.e. pressing Enter in the middle of a word will insert two <br> elements.