[KBSWITCH][CPL:INPUT][NTUSER][EXPLORER] Fix keyboard layout icon (#4815)

Fix keyboard layout icon in taskbar notification area. JIRA issue: CORE-11700, CORE-2699, CORE-18546
- Call ActivateKeyboardLayout to select the keyboard layout correctly.
- Modify WM_INPUTLANGCHANGEREQUEST parameter.
- Modify BroadcastSystemMessageW parameter.
- Revert Taskbar Notification Area MA_NOACTIVATE HACK 8344291 . This fixes Context Menu display.
- Load the "IME File" value and set the IME icon if necessary.
- Correctly implement global hooks.

base/applications/kbswitch/CMakeLists.txt

@@ -2,7 +2,7 @@
 add_rc_deps(kbswitch.rc ${CMAKE_CURRENT_SOURCE_DIR}/res/kbswitch.ico)
 add_executable(kbswitch kbswitch.c kbswitch.rc)
 set_module_type(kbswitch win32gui UNICODE)
-add_importlibs(kbswitch advapi32 user32 shell32 gdi32 msvcrt kernel32)
+add_importlibs(kbswitch advapi32 imm32 user32 shell32 gdi32 msvcrt kernel32)
 add_cd_file(TARGET kbswitch DESTINATION reactos/system32 FOR all)
 
 add_subdirectory(kbsdll)

base/applications/kbswitch/kbsdll/kbsdll.c

@@ -13,44 +13,48 @@ HINSTANCE hInstance = NULL;
 HWND hKbSwitchWnd = NULL;
 
 static VOID
-SendMessageToMainWnd(UINT Msg, WPARAM wParam, LPARAM lParam)
+PostMessageToMainWnd(UINT Msg, WPARAM wParam, LPARAM lParam)
 {
     PostMessage(hKbSwitchWnd, Msg, wParam, lParam);
 }
 
 LRESULT CALLBACK
 WinHookProc(int code, WPARAM wParam, LPARAM lParam)
 {
-    int id = GlobalAddAtom(_T("KBSWITCH"));
+    if (code < 0)
+    {
+        return CallNextHookEx(hWinHook, code, wParam, lParam);
+    }
 
     switch (code)
     {
         case HCBT_SETFOCUS:
         {
-            if ((HWND)wParam != NULL)
+            HWND hwndFocus = (HWND)wParam;
+            if (hwndFocus && hwndFocus != hKbSwitchWnd)
             {
-                if ((HWND)wParam != hKbSwitchWnd)
-                {
-                    SendMessageToMainWnd(WM_WINDOW_ACTIVATE, wParam, lParam);
-                }
+                PostMessageToMainWnd(WM_WINDOW_ACTIVATE, wParam, lParam);
             }
         }
         break;
     }
 
-    GlobalDeleteAtom(id);
-
     return CallNextHookEx(hWinHook, code, wParam, lParam);
 }
 
 LRESULT CALLBACK
 ShellHookProc(int code, WPARAM wParam, LPARAM lParam)
 {
+    if (code < 0)
+    {
+        return CallNextHookEx(hShellHook, code, wParam, lParam);
+    }
+
     switch (code)
     {
         case HSHELL_LANGUAGE:
         {
-            SendMessageToMainWnd(WM_LANG_CHANGED, wParam, lParam);
+            PostMessageToMainWnd(WM_LANG_CHANGED, wParam, lParam);
         }
         break;
     }
@@ -75,8 +79,16 @@ KbSwitchSetHooks(VOID)
 VOID WINAPI
 KbSwitchDeleteHooks(VOID)
 {
-    if (hWinHook) UnhookWindowsHookEx(hWinHook);
-    if (hShellHook) UnhookWindowsHookEx(hShellHook);
+    if (hWinHook)
+    {
+        UnhookWindowsHookEx(hWinHook);
+        hWinHook = NULL;
+    }
+    if (hShellHook)
+    {
+        UnhookWindowsHookEx(hShellHook);
+        hShellHook = NULL;
+    }
 }
 
 BOOL WINAPI