The WM_CAPTURECHANGED message is sent to the window that is losing the mouse capture.
WM_CAPTURECHANGED hwndNewCapture = (HWND) lParam; // handle of window to gain mouse capture
An application should return zero if it processes this message.
A window receives this message even if it calls ReleaseCapture itself. An application should not attempt to set the mouse capture in response to this message.
When it receives this message, a window should redraw itself, if necessary, to reflect the new mouse-capture state.
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