Resolved Bugs
- Removed double DOCTYPE (this happened in IE11 mode)
- Changing font style could remove html of selected element on the left of selection
- changing font style could remove html of selected element on the left of selection
- ObjectDisposedException could happen sometimes if the editor is closed quickly just after was opened
- Editor threw exception about not supported encoding unicodeFEFF
- changing font style could double selected html if selected html was not removable (SelectionLogic.GetTrimmedSelection() could create not removable html)