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 | inlinevirtual | 
Updates bounds of collapsible node when a text is deleted from the edit control.
This function is called by the edit control to properly update the collapsible node's bounds in case the text in a collapsible node is being deleted partially.
| nStart | Specifies the top zero-based offset in the internal buffer of the edit control. | 
| nEnd | Specifies the bottom zero-based offset in the internal buffer of the edit control. | 
Reimplemented in CBCGPOutlineNode.