[SHELL32][SDK] Implement Activate_RunDLL (#5840)

- Add Activate_RunDLL function implementation.
- Add Activate_RunDLL prototype to <undocshell.h>.

dll/win32/shell32/stubs.cpp

@@ -801,17 +801,6 @@ SHIsBadInterfacePtr(LPVOID pv, UINT ucb)
     return FALSE;
 }
 
-/*
- * Unimplemented
- */
-EXTERN_C BOOL
-WINAPI
-Activate_RunDLL(DWORD dwProcessId, LPVOID lpUnused1, LPVOID lpUnused2, LPVOID lpUnused3)
-{
-    FIXME("Activate_RunDLL() stub\n");
-    return FALSE;
-}
-
 /*
  * Unimplemented
  */

dll/win32/shell32/utils.cpp

@@ -577,3 +577,30 @@ SHOpenPropSheetA(
     return SHOpenPropSheetW(pszCaptionW, ahKeys, cKeys, pclsidDefault,
                             pDataObject, pShellBrowser, pszStartPageW);
 }
+
+/*************************************************************************
+ *  Activate_RunDLL [SHELL32.105]
+ *
+ * Unlocks the foreground window and allows the shell window to become the
+ * foreground window. Every parameter is unused.
+ */
+EXTERN_C
+BOOL WINAPI
+Activate_RunDLL(
+    _In_ DWORD dwUnused1,
+    _In_ LPVOID lpUnused2,
+    _In_ LPVOID lpUnused3,
+    _In_ LPVOID lpUnused4)
+{
+    DWORD dwPID;
+
+    UNREFERENCED_PARAMETER(dwUnused1);
+    UNREFERENCED_PARAMETER(lpUnused2);
+    UNREFERENCED_PARAMETER(lpUnused3);
+    UNREFERENCED_PARAMETER(lpUnused4);
+
+    TRACE("(%lu, %p, %p, %p)\n", dwUnused1, lpUnused2, lpUnused3, lpUnused4);
+
+    GetWindowThreadProcessId(GetShellWindow(), &dwPID);
+    return AllowSetForegroundWindow(dwPID);
+}

sdk/include/reactos/undocshell.h

@@ -720,6 +720,13 @@ BOOL WINAPI
 SHTestTokenPrivilegeW(_In_opt_ HANDLE hToken, _In_z_ LPCWSTR lpName);
 BOOL WINAPI IsSuspendAllowed(VOID);
 
+BOOL WINAPI
+Activate_RunDLL(
+    _In_ DWORD dwUnused1,
+    _In_ LPVOID lpUnused2,
+    _In_ LPVOID lpUnused3,
+    _In_ LPVOID lpUnused4);
+
 /*****************************************************************************
  * Shell32 resources
  */