Preserve cursor position on editor.cleanUp()

[tremby]

It would be great to have cursor position preserved when running editor.cleanUp().

Ideally if elements are removed the cursor would remain in the same position with respect to the text, rather than simply staying the same number of characters from the start of the field.

[starlocke]

I get the feeling that this no longer works, since the console logs this error when cleanUp() is invoked.

Rangy warning: Module SaveRestore: Marker element has been removed. Cannot restore selection.