win32u: Move GetClientRect implementation from user32.

dlls/user32/winpos.c

@@ -225,7 +225,7 @@ int WINAPI SetWindowRgn( HWND hwnd, HRGN hrgn, BOOL bRedraw )
  */
 BOOL WINAPI GetClientRect( HWND hwnd, LPRECT rect )
 {
-    return WIN_GetRectangles( hwnd, COORDS_CLIENT, NULL, rect );
+    return NtUserCallHwndParam( hwnd, (UINT_PTR)rect, NtUserGetClientRect );
 }
 
 

dlls/win32u/window.c

@@ -1139,6 +1139,12 @@ BOOL get_window_rect( HWND hwnd, RECT *rect )
     return get_window_rects( hwnd, COORDS_SCREEN, rect, NULL, get_thread_dpi() );
 }
 
+/* see GetClientRect */
+static BOOL get_client_rect( HWND hwnd, RECT *rect )
+{
+    return get_window_rects( hwnd, COORDS_CLIENT, NULL, rect, get_thread_dpi() );
+}
+
 /* see GetWindowInfo */
 static BOOL get_window_info( HWND hwnd, WINDOWINFO *info )
 {
@@ -1357,6 +1363,8 @@ ULONG_PTR WINAPI NtUserCallHwndParam( HWND hwnd, DWORD_PTR param, DWORD code )
         return get_class_long_ptr( hwnd, param, FALSE );
     case NtUserGetClassWord:
         return get_class_word( hwnd, param );
+    case NtUserGetClientRect:
+        return get_client_rect( hwnd, (RECT *)param );
     case NtUserGetWindowInfo:
         return get_window_info( hwnd, (WINDOWINFO *)param );
     case NtUserGetWindowLongA:

include/ntuser.h

@@ -160,6 +160,7 @@ enum
     NtUserGetClassLongPtrA,
     NtUserGetClassLongPtrW,
     NtUserGetClassWord,
+    NtUserGetClientRect,
     NtUserGetWindowInfo,
     NtUserGetWindowLongA,
     NtUserGetWindowLongW,