The default IME window has to be created for each top-level window in specific condition. It is needed for implementing Japanese input.
- Add IntFocusSetInputContext helper function.
- Call IntFocusSetInputContext after sending WM_KILLFOCUS message.
- Add IntWantImeWindow, co_IntCreateDefaultImeWindow, and IntDestroyOwnedWindows helper functions.
- Create the default IME window (spwndDefaultIme) for the specified window at IntCreateWindow.
- Fix Imm32InternalLockIMC function.
CORE-11700
- Add IntIsWindowFullscreen function to judge whether the window is fullscreen.
- Add IntCheckFullscreen function to notify HSHELL_RUDEAPPACTIVATE if fullscreen.
- Add IntCheckFullscreen call in UpdateShellHook function.
- Add IntCheckFullscreen call in co_WinPosSetWindowPos function.
CORE-16130
