gdi32: Mirror the returned rectangle in GetClipBox for RTL layout.

dlls/gdi32/clipping.c

@@ -400,6 +400,12 @@ INT WINAPI GetClipBox( HDC hdc, LPRECT rect )
         DeleteObject( hrgn );
     }
     else ret = GetRgnBox( dc->hVisRgn, rect );
+    if (dc->layout & LAYOUT_RTL)
+    {
+        int tmp = rect->left;
+        rect->left = rect->right - 1;
+        rect->right = tmp - 1;
+    }
     DPtoLP( hdc, (LPPOINT)rect, 2 );
     release_dc_ptr( dc );
     return ret;

dlls/gdi32/tests/mapping.c

@@ -313,6 +313,9 @@ static void test_dc_layout(void)
     GetRgnBox( hrgn, &ret_rc );
     ok( EqualRect( &rc, &ret_rc ), "wrong clip box %d,%d - %d,%d\n",
         ret_rc.left, ret_rc.top, ret_rc.right, ret_rc.bottom );
+    GetClipBox( hdc, &ret_rc );
+    ok( EqualRect( &rc, &ret_rc ), "wrong clip box %d,%d - %d,%d\n",
+        ret_rc.left, ret_rc.top, ret_rc.right, ret_rc.bottom );
     SetRectRgn( hrgn, 60, 10, 80, 20 );
     pSetLayout( hdc, LAYOUT_LTR );
     ExtSelectClipRgn( hdc, hrgn, RGN_OR );
@@ -322,6 +325,9 @@ static void test_dc_layout(void)
     GetRgnBox( hrgn, &ret_rc );
     ok( EqualRect( &rc, &ret_rc ), "wrong clip box %d,%d - %d,%d\n",
         ret_rc.left, ret_rc.top, ret_rc.right, ret_rc.bottom );
+    GetClipBox( hdc, &ret_rc );
+    ok( EqualRect( &rc, &ret_rc ), "wrong clip box %d,%d - %d,%d\n",
+        ret_rc.left, ret_rc.top, ret_rc.right, ret_rc.bottom );
 
     /* OffsetClipRgn mirrors too */
     OffsetClipRgn( hdc, 5, 5 );