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In particular, not let ResizeReflow take the old and new size. Most of the callers pass dummy values anyway. Instead, use the old size of the layout viewport. This ensures we fire resize events only if the layout viewport actually changes. This is important because the first resize of the mobile viewport manager after a navigation has an "old size" of 0x0, even though the layout viewport is initialized on presshell initialization to the right size. Thus, we fire resize events unnecessarily in that case, which is the root cause for bug 1528052. To do this, we need to shuffle a bit of code in nsDocumentViewer that deals with delayed resizes, to set the visible area _and_ invalidate layout, rather than setting the visible area and _then_ relying on doing a resize reflow. Further cleanup is possible, though not required for my android resizing fix, so will do separately. Differential Revision: https://phabricator.services.mozilla.com/D46944 --HG-- extra : moz-landing-system : lando |
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