comctl32/header: Do not touch 'hwnd' field in HDM_LAYOUT.

dlls/comctl32/header.c

@@ -1465,7 +1465,6 @@ HEADER_InsertItemT (HEADER_INFO *infoPtr, INT nItem, const HDITEMW *phdi, BOOL b
 static LRESULT
 HEADER_Layout (HEADER_INFO *infoPtr, LPHDLAYOUT lpLayout)
 {
-    lpLayout->pwpos->hwnd = infoPtr->hwndSelf;
     lpLayout->pwpos->hwndInsertAfter = 0;
     lpLayout->pwpos->x = lpLayout->prc->left;
     lpLayout->pwpos->y = lpLayout->prc->top;

dlls/comctl32/listview.c

@@ -11184,7 +11184,7 @@ static void LISTVIEW_UpdateSize(LISTVIEW_INFO *infoPtr)
 	    wp.cy = 0;
 	}
 
-	SetWindowPos(wp.hwnd, wp.hwndInsertAfter, wp.x, wp.y, wp.cx, wp.cy, wp.flags);
+	SetWindowPos(infoPtr->hwndHeader, wp.hwndInsertAfter, wp.x, wp.y, wp.cx, wp.cy, wp.flags);
 	TRACE("  after SWP wp=%d,%d (%dx%d)\n", wp.x, wp.y, wp.cx, wp.cy);
 
 	infoPtr->rcList.top = max(wp.cy, 0);

dlls/comctl32/tests/header.c

@@ -873,9 +873,12 @@ static void test_hdm_layout(HWND hParent)
     ok_sequence(sequences, PARENT_SEQ_INDEX, add_header_to_parent_seq,
                                     "adder header control to parent", FALSE);
 
+    windowPos.hwnd = (HWND)0xdeadbeef;
     flush_sequences(sequences, NUM_MSG_SEQUENCES);
     retVal = SendMessageA(hChild, HDM_LAYOUT, 0, (LPARAM) &hdLayout);
     expect(TRUE, retVal);
+    ok(windowPos.hwnd == (HWND)0xdeadbeef, "Unexpected value %p.\n", windowPos.hwnd);
+    ok(!windowPos.hwndInsertAfter, "Unexpected value %p.\n", windowPos.hwndInsertAfter);
 
     ok_sequence(sequences, HEADER_SEQ_INDEX, layout_seq, "layout sequence testing", FALSE);
 
@@ -1884,6 +1887,7 @@ START_TEST(header)
     test_hdf_fixedwidth(parent_hwnd);
     test_hds_nosizing(parent_hwnd);
     test_item_auto_format(parent_hwnd);
+    test_hdm_layout(parent_hwnd);
 
     unload_v6_module(ctx_cookie, hCtx);