EN_REQUESTRESIZE notification code
Notifies a rich edit control's parent window that the control's contents are either smaller or larger than the control's window size. A rich edit control sends this notification code in the form of a WM_NOTIFY message.
A REQRESIZE structure that receives the requested size.
This notification code does not return a value.
To support the bottomless behavior of a rich edit control, the parent window must resize the control when it receives this notification code.
Minimum supported client
|Windows Vista [desktop apps only]|
Minimum supported server
|Windows Server 2003 [desktop apps only]|