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45c1d2b0ce
In IE8, when a page in the preview iframe uses a web font (not just references it in CSS, but actually has glyphs present in the page), the fonts in the containing admin interface will become corrupted (display as all squares) until the mouse moves. This commit uses the technique described at http://stackoverflow.com/questions/9809351/ie8-css-font-face-fonts-only-working-for-before-content-on-over-and-sometimes#10557782 to cause the admin panel to re-calculated all it's fonts after the preview iframe has loaded, fixing the glitch