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This page is changing the title attribute on an ancestor while we move the mouse around in a canvas. Our code assumes that given we've moved the mouse around and hid the tooltip we shouldn't show it again until the next mouseout. Instead of keeping track of whether we've already shown the tooltip, keep track of the last used tooltip string, and avoid showing the tooltip again in the callback if it's the same. Differential Revision: https://phabricator.services.mozilla.com/D4443 --HG-- extra : moz-landing-system : lando