Thank you for your feature request.
Unfortunately, this user friendly feature could not be implemented in RadEditor, because the Html and Design modes are two different IFRAME
elements (documents) and during the switch from Design to Html mode the selection is automatically lost.
In addition, the content is parsed by the editor's content filters to make it valid XHTML. This process modifies the content and it is not possible to programmatically restore the selection.
By the way, have you by any chance seen a DHTML web editor that supports this feature?
You can use the Real Time HTML View module
as an HTML editor in Design mode, but it will not show the selection in the Design mode, because it is not possible to have two selections at the same time in the browser. You should click in the content area to enable the modules and populate them with content.
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