[webkit-dev] Touch operation corrupts screen when specifying other than overflow:visible in css

Thu Oct 18 19:47:37 PDT 2012

Please file a bug at https://bugs.webkit.org with the component WebKit Misc. and attach your test case as an HTML file. Please also CC me on it (bweinstein at apple.com).

Thanks!
Brian Weinstein 

On Oct 17, 2012, at 12:58 AM, HIDEKI YOSHIDA <yoshida-hxa at necst.nec.co.jp> wrote:

> 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-hxa at necst.nec.co.jp
> ***************************************************************************
> 
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