| 
  virtual | 
Called when a piece of text is being inserted into the edit control.
The default implementation calculates the number of inserted lines and updates the relevant line-related data (markers).
| nStartOffset | Offset to insert at. | 
| strInsertedText | Inserted text. | 
| bUpdateLineData | Specifies whether to update line related data. For example, line related data (markers) is not updated when the entire text is replaced. |