[PATCH 0/1] MR3184: win32u: Don't affect nonclient area unles requested.

[Arek Hiler (＠ivyl)]

Overwatch 2 calls `FlashWindowEx()` with `dwFlags = FLASHW_TRAY | FLASHW_TIMERNOFG` whenever you join an online game or respawn after getting killed. Without this MR the call causes us to send `WM_NCACTIVATE` with `wparam = FALSE`. This confuses the game and it stops reading controller input until you Alt+Tab out and back in to "reactivate" the nonclient area.

`WM_NCACTIVATE` should be only sent when there's `FLASHW_CAPTION` or `FLASHW_STOP` specified.