Bug 155608 – Images in feed on ebay.com jiggle when one is hovered

• Component: Layout and Rendering
• Status: RESOLVED FIXED

[zalan]

1. Have some eBay searches set up, so that when you are logged into ebay, and go to eBay.com, you get a “feed” page with a wall of items.
2. Now hover over one image on the left side of a row. Note how the other images on that row jiggle by a pixel.

[zalan]

rdar://problem/25160681

[zalan]

Created attachment 274339 [details]
Patch

[Simon Fraser (smfr)]

Comment on attachment 274339 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=274339&action=review

> Source/WebCore/rendering/RenderLayerBacking.h:370
> +    LayoutSize m_layerBoundsDistanceFromGraphicsLayer; // This is the (subpixel) distance between the edge of the graphics layer and the layer bounds.

Maybe "m_compositedBoundsDeltaFromGraphicsLayer?

> LayoutTests/compositing/hidpi-viewport-clipping-on-composited-content.html:34
> +for (i = 0; i < 50; ++i) {
> +    var element = document.createElement("div");
> +    element.className = "jiggle";
> +    element.style.top = (6 * i) + "px";
> +    element.style.left = leftPos + "px";
> +	document.body.appendChild(element);
> +	leftPos -= 0.1;
> +}

Does this fit in the 600px tall snapshot?

[zalan]

Committed r198374: <http://trac.webkit.org/changeset/198374>