IME: Fix Multi-Window Duplicated First Character

Fix problem with duplicated initial character when initiating or
switching to new windows. This is done by updating our copies of state
and modes from the new window when it receives WM_IME_SETCONTEXT
message. This problem and fix are only for the Windows platform.

intern/ghost/intern/GHOST_SystemWin32.cpp

@@ -1472,6 +1472,7 @@ LRESULT WINAPI GHOST_SystemWin32::s_wndProc(HWND hwnd, UINT msg, WPARAM wParam,
         case WM_IME_SETCONTEXT: {
           GHOST_ImeWin32 *ime = window->getImeInput();
           ime->UpdateInputLanguage();
+          ime->UpdateConversionStatus(hwnd);
           ime->CreateImeWindow(hwnd);
           ime->CleanupComposition(hwnd);
           ime->CheckFirst(hwnd);