Hi, my team made the workaround to fix this problem and has submitted it as a patch to get a review.
https://bugs.webkit.org/show_bug.cgi?id=99842 Index: Source/WebCore/platform/graphics/win/GraphicsContextCairoWin.cpp =================================================================== --- Source/WebKit/win/WebView.cpp (revision 132968) +++ Source/WebKit/win/WebView.cpp (working copy) @@ -1663,7 +1663,7 @@ return false; // We negate here since panning up moves the content up, but moves the scrollbar down. - m_gestureTargetNode->renderer()->enclosingLayer()->scrollByRecursively(IntSize(-deltaX, -deltaY)); + m_gestureTargetNode->renderer()->enclosingLayer()->scrollByRecursively(IntSize(-deltaX, -deltaY), WebCore::RenderLayer::ScrollOffsetClamping::ScrollOffsetClamped); if (!(UpdatePanningFeedbackPtr() && BeginPanningFeedbackPtr() && EndPanningFeedbackPtr())) { CloseGestureInfoHandlePtr()(gestureHandle); Hideki *************************************************************************** Hideki Yoshida Embedded Software Division NEC System Technologies, Ltd. E-MAIL:yoshida-...@necst.nec.co.jp TEL:+81-78-991-5566 FAX:+81-78-991-5568 *************************************************************************** > Hi, I filed this problem to https://bugs.webkit.org with > test case as an HTML file after I was suggested to do so. > > Bug id 99842. > > I am trying to find a workaround to resolve this problem. > If someone has it, post it, please. > > > Hi, > > > > On a windows 7 tablet, PAN operation(=scroll) causes > > corruption of screen. > > > > Does anybody know how to resolve this or have the fix? > > > > How to reproduce. > > 1. Prepare a HTML contents which have an element specifying > > other than "visible" to the property overflow in css. > > 2. Load the contents with webkit > > 3. Operate the touch operaion, PAN on the element. > > > > Problem > > The content in the element protrudes outside the placeholder > > for it and can disappear. > > > > The build version > > Webkit.exe on r131112 for Nightly builds > > > > We guess Source\WebKit\win\WebView.cpp has some bugs on this > > issue. > > > > Here is the sample contents to reproduce problem. You will see the > > problem if you PAN on the field for "overflow:auto". > > > > ---------- > > <HTML> > > <HEAD><TITLE>pan with css:overflow</TITLE></HEAD> > > <BODY> > > <font size="+2"> > > <div style="border: 2px solid blue; padding: 5px 5px 5px 5px; > > overflow:visible;"> > > overflow:visible > > </div> > > <br> > > <div style="border: 2px solid red; padding: 5px 5px 5px 5px; > > overflow:auto;"> > > overflow:auto > > </div> > > </font> > > </BODY> > > </HTML> > > ---------- > > > > Hideki > > > > *************************************************************************** > > Hideki Yoshida > > Embedded Software Division > > NEC System Technologies, Ltd. > > E-MAIL:yoshida-...@necst.nec.co.jp > > *************************************************************************** > _______________________________________________ webkit-dev mailing list webkit-dev@lists.webkit.org http://lists.webkit.org/mailman/listinfo/webkit-dev
