[WIN32SS:NTUSER] Implement SharedUserData->LastSystemRITEventTickCount (#8537)

This field was introduced in NT5.1, records the tick count of the last user input
(system-wide), updated at most once per minute (or once per second since NT6.0).

Unlike `GetLastInputInfo` which is designed for providing session-specific
user input information, `SharedUserData->LastSystemRITEventTickCount` provides
system-wide time, used by:
- [Task Schedule (TASK_EVENT_TRIGGER_ON_IDLE)](https://learn.microsoft.com/en-us/windows/win32/taskschd/i)
- [Inactivity Monitoring](https://learn.microsoft.com/en-us/windows/win32/devnotes/inactivity-monitoring)
- Maybe some places I don't know...

See also:
- [KUSER_SHARED_DATA - Geoff Chappell](https://www.geoffchappell.com/studies/windows/km/ntoskrnl/inc/api/ntexapi_x/kuser_shared_data/index.htm)
- [TASK_TRIGGER_TYPE enumeration - Microsoft Learn](https://learn.microsoft.com/en-us/windows/win32/api/mstask/ne-mstask-task_trigger_type)
- [Task Scheduler: idle conditions](https://learn.microsoft.com/en-us/windows/win32/taskschd/i)
- [GetLastInputInfo function - Microsoft Learn](https://learn.microsoft.com/en-us/windows/win32/api/winuser/nf-winuser-getlastinputinfo)
- [Inactivity Monitoring](https://learn.microsoft.com/en-us/windows/win32/devnotes/inactivity-monitoring)

## Proposed changes

Before this PR, `SharedUserData->LastSystemRITEventTickCount` is never used
and always 0, `gpsi->dwLastSystemRITEventTickCountUpdate` is never used too.
After this PR, `SharedUserData->LastSystemRITEventTickCount` updates correctly
by using `gpsi->dwLastSystemRITEventTickCountUpdate` to record previous update
time, the behavior is the same as on Windows.

modules/rostests/win32/user32/CMakeLists.txt

@@ -3,4 +3,5 @@ add_subdirectory(messagebox)
 add_subdirectory(paintdesktop)
 add_subdirectory(psmtest)
 add_subdirectory(sysicon)
+add_subdirectory(useridletime)
 add_subdirectory(winstation)

modules/rostests/win32/user32/useridletime/CMakeLists.txt

@@ -0,0 +1,5 @@
+
+add_executable(useridletime UserIdleTime.c)
+set_module_type(useridletime win32cui UNICODE)
+add_importlibs(useridletime user32 msvcrt kernel32)
+add_rostests_file(TARGET useridletime SUBDIR suppl)

modules/rostests/win32/user32/useridletime/UserIdleTime.c

@@ -0,0 +1,47 @@
+/*
+ * PROJECT:     ReactOS Tests
+ * LICENSE:     MIT (https://spdx.org/licenses/MIT)
+ * PURPOSE:     Calculate and print user idle time once per second by using
+ *              user32!GetLastInputInfo() API and SharedUserData->LastSystemRITEventTickCount
+ *              field separately. The former updates in real-time, while the latter updates
+ *              periodically (60s in NT5, 1s since NT6.0). Press Ctrl+C to exit this program.
+ * COPYRIGHT:   Copyright 2026 Ratin Gao <ratin@knsoft.org>
+ */
+
+#include <stdio.h>
+
+#define WIN32_NO_STATUS
+#include <windef.h>
+#include <winbase.h>
+#include <winuser.h>
+
+#define NTOS_MODE_USER
+#include <ndk/psfuncs.h>
+
+int
+_cdecl
+wmain(
+    _In_ int argc,
+    _In_reads_(argc) _Pre_z_ wchar_t** argv)
+{
+    DWORD dwTickCount, dwError;
+    LASTINPUTINFO lii = { sizeof(lii) };
+
+    puts("User idle time in second (LastSystemRITEventTickCount, GetLastInputInfo):");
+    for (;;)
+    {
+        dwTickCount = GetTickCount();
+        if (!GetLastInputInfo(&lii))
+        {
+            dwError = GetLastError();
+            printf("GetLastInputInfo failed with: 0x%08lX\n", dwError);
+            return dwError;
+        }
+        printf("\t%lu, %lu\n",
+               (dwTickCount - SharedUserData->LastSystemRITEventTickCount) / 1000UL,
+               (dwTickCount - lii.dwTime) / 1000UL);
+        Sleep(1000);
+    }
+
+    return 0;
+}

win32ss/user/ntuser/input.c

@@ -10,6 +10,13 @@
 #include <win32k.h>
 DBG_DEFAULT_CHANNEL(UserInput);
 
+/* LastRITEventTickCount update cycle has been adjusted from 60s to 1s since NT6 */
+#if (NTDDI_VERSION < NTDDI_VISTA)
+#define LAST_RIT_EVENT_UPDATE_INTERVAL 60000UL
+#else
+#define LAST_RIT_EVENT_UPDATE_INTERVAL 1000UL
+#endif
+
 /* GLOBALS *******************************************************************/
 
 PTHREADINFO ptiRawInput;
@@ -34,7 +41,16 @@ IntLastInputTick(BOOL bUpdate)
     if (bUpdate)
     {
         LastInputTick = EngGetTickCount32();
-        if (gpsi) gpsi->dwLastRITEventTickCount = LastInputTick;
+        if (gpsi)
+        {
+            gpsi->dwLastRITEventTickCount = LastInputTick;
+            if (gpsi->dwLastRITEventTickCount - gpsi->dwLastSystemRITEventTickCountUpdate >
+                LAST_RIT_EVENT_UPDATE_INTERVAL)
+            {
+                SharedUserData->LastSystemRITEventTickCount = LastInputTick;
+                gpsi->dwLastSystemRITEventTickCountUpdate = LastInputTick;
+            }
+        }
     }
     return LastInputTick;
 }