[Webkit-unassigned] [Bug 96382] Android's mock scrollbars shows up as a difference in layout test results

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=96382





--- Comment #7 from Peter Beverloo <peter at chromium.org>  2012-09-12 10:37:25 PST ---
(In reply to comment #5)
> Layers don't show up in the text output unless the test asks for them by testRunner.layerTreeAsText().
> 
> Do you want scrollbars to show up in the .pngs at all on android?  They don't occupy space (do they?) so maybe you should just leave them out.  That means you can't share pixel baselines with other ports on tests with visible scrollbars, but you aren't sharing behavior either thanks to overlay so that seems appropriate.

I see, that's good news, so we can enable forced compositing.

Do you think it'd be fine to now show scrollbars altogether? They're layers in a parallel tree and are drawn a top of the content, so it seems to me that they indeed don't occupy space.

My concern is that this would make it impossible to determine whether the content exceeds the result's viewport or not.
Since we're not going to be able to share the results anyway, both (a) being closer to what we ship and (b) making it more obvious why a test may be failing in case of scrolling content make me think that we should enable them.

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