comctl32: rebar: Invalidate children in CalcHorz/VertBand.

dlls/comctl32/rebar.c

@@ -796,6 +796,7 @@ REBAR_CalcHorzBand (const REBAR_INFO *infoPtr, UINT rstart, UINT rend)
 	  work.right += SEP_WIDTH;
 	  work.bottom += SEP_WIDTH;
 	  InvalidateRect(infoPtr->hwndSelf, &work, TRUE);
+	  InvalidateRect(lpBand->hwndChild, NULL, TRUE);
       }
 
     }
@@ -916,6 +917,7 @@ REBAR_CalcVertBand (const REBAR_INFO *infoPtr, UINT rstart, UINT rend)
 	    work.bottom += SEP_WIDTH;
 	    work.right += SEP_WIDTH;
 	    InvalidateRect(infoPtr->hwndSelf, &work, TRUE);
+	    InvalidateRect(lpBand->hwndChild, NULL, TRUE);
 	}
 
     }
@@ -2788,7 +2790,6 @@ REBAR_SizeToRect (REBAR_INFO *infoPtr, WPARAM wParam, LPARAM lParam)
 
     TRACE("[%s]\n", wine_dbgstr_rect(lpRect));
     REBAR_SizeToHeight(infoPtr, get_rect_cy(infoPtr, lpRect));
-    InvalidateRect (infoPtr->hwndSelf, NULL, TRUE);
     return TRUE;
 }