This function has a dependency on AllowExternalDrop property of
CoreWebView2Controller and return E_FAIL to callers to indicate this
operation is not allowed if AllowExternalDrop property is set to false.
The hosting application must register as an IDropTarget and implement
and forward DragLeave calls to this function.
This function corresponds to IDropTarget::DragLeave.
This function has a dependency on AllowExternalDrop property of CoreWebView2Controller and return E_FAIL to callers to indicate this operation is not allowed if AllowExternalDrop property is set to false.
The hosting application must register as an IDropTarget and implement and forward DragLeave calls to this function.
\snippet DropTarget.cpp DragLeave