Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=57370
-- v3: winex11: Always generate ConfigureNotify events for embedded windows. winex11: Generate ConfigureNotify events for the children tree. winex11: Avoid overriding previously received ConfigureNotify events. winex11: Retrieve the HWND for the host window's child window. winex11: Introduce a new host_window_send_configure_events helper. winex11: Reset the window relative position when it gets reparented. winex11: Reset embedded window position to 0x0 before docking it.