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Andrew Osmond authored
Historically there were kludges in how we chose to snap layers and transforms, nominally for performance reasons (see bug 602200 comment 36). WebRender appears to render what was considered at the time the ideal outcome, which also makes the most sense as a content author. Given we are otherwise lacking a reason to continue with the old behaviour, this patch adds a new test case to confirm WebRender snaps in the ideal fashion, and non-WebRender does not. Differential Revision: https://phabricator.services.mozilla.com/D55852 --HG-- extra : moz-landing-system : lando
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