SWP_FRAMECHANGED top-level constant Null safety
Applies new frame styles set using the SetWindowLong function. Sends a WM_NCCALCSIZE message to the window, even if the window's size is not being changed. If this flag is not specified, WM_NCCALCSIZE is sent only when the window's size is being changed.
const SWP_FRAMECHANGED = 0x0020;