Fix for "Cursor Positioning Wrong when pressing Space".
The reason was, that in some cases (I'm not sure what the conditions are) the whole editor component is rebuild after changing the text. The cursor positioning after inserting a space doesn't work in this case, because the multiline cell instance that does the model modification is not the same as the instance that shows the new model.

Known Bug: Deleting a space causes a loss of the caret for the same reasons.