comctl32/listview: Don't invalidate when new style is same as old.

dlls/comctl32/listview.c

@@ -11108,14 +11108,13 @@ static void LISTVIEW_UpdateSize(LISTVIEW_INFO *infoPtr)
 static INT LISTVIEW_StyleChanged(LISTVIEW_INFO *infoPtr, WPARAM wStyleType,
                                  const STYLESTRUCT *lpss)
 {
-    UINT uNewView = lpss->styleNew & LVS_TYPEMASK;
-    UINT uOldView = lpss->styleOld & LVS_TYPEMASK;
+    UINT uNewView, uOldView;
     UINT style;
 
     TRACE("(styletype=%lx, styleOld=0x%08x, styleNew=0x%08x)\n",
           wStyleType, lpss->styleOld, lpss->styleNew);
 
-    if (wStyleType != GWL_STYLE) return 0;
+    if (wStyleType != GWL_STYLE || lpss->styleNew == infoPtr->dwStyle) return 0;
 
     infoPtr->dwStyle = lpss->styleNew;
 
@@ -11127,6 +11126,9 @@ static INT LISTVIEW_StyleChanged(LISTVIEW_INFO *infoPtr, WPARAM wStyleType,
         ((lpss->styleNew & WS_VSCROLL) == 0))
        ShowScrollBar(infoPtr->hwndSelf, SB_VERT, FALSE);
 
+    uNewView = lpss->styleNew & LVS_TYPEMASK;
+    uOldView = lpss->styleOld & LVS_TYPEMASK;
+
     if (uNewView != uOldView)
     {
     	HIMAGELIST himl;

dlls/comctl32/tests/listview.c

@@ -1781,6 +1781,7 @@ static void test_redraw(void)
     HDC hdc;
     BOOL res;
     DWORD r;
+    RECT rect;
 
     hwnd = create_listview_control(LVS_REPORT);
     subclass_header(hwnd);
@@ -1838,6 +1839,13 @@ static void test_redraw(void)
 
     ReleaseDC(hwndparent, hdc);
 
+    /* test setting the window style to what it already was */
+    UpdateWindow(hwnd);
+    SetWindowLongA(hwnd, GWL_STYLE, GetWindowLongA(hwnd, GWL_STYLE));
+    GetUpdateRect(hwnd, &rect, FALSE);
+    ok(rect.left == 0 && rect.top == 0 && rect.right == 0 && rect.bottom == 0,
+       "Expected empty update rect, got %s\n", wine_dbgstr_rect(&rect));
+
     DestroyWindow(hwnd);
 }