зеркало из https://github.com/mozilla/gecko-dev.git
40a788d924
There's two code changes in this patch: - The update to the visual viewport that was happening just before positioning the fixed items gets moved to happen after determining the scrollbars for the root scrollframe. This moves it a little bit earlier, to basically the earliest point at which the visual viewport can actually be computed, since it depends on the presence of the root scrollframe's scrollbars. More importantly, this change sets the visual viewport without checking to see if one was already set, as the old code did. This means every reflow of the root scrollframe on a presShell with an MVM will now have a visual viewport set. Previously the visual viewport would only get set for the first time when the MVM got a load or first-paint event, and then would get updated for subsequent reflows. The net effect here is that the visual viewport is set earlier, and this can sometimes eliminate extra reflows from after the load event, because everything is already in a consistent state. - The NotifyResizeReflow call to MVM is replaced by a NotifyReflow call that runs before every reflow, instead of just on resizes. Note that the NotifyReflow also doesn't update the visual viewport like NotifyResizeReflow used to do, because that is taken care of by the above-mentioned code change to set the visual viewport. This is desirable because there are things that run during reflow that attempt to read the display size from the MVM, and they were getting a zero size for reflows that happened before the first resize or load/first-paint events. Now they get a valid display size on every reflow, and so again this allows fewer overall reflows as the code converges to a stable state faster. Together these changes ensure that every reflow has access to up-to-date properties (display size, mobile viewport size, visual viewport size) from the MVM. This eliminates unnecessary reflows because of out-of-order computations based on stale values and such. Therefore the number of reflows goes down, which is reflected by the changes to the crashtest assertion counts. Differential Revision: https://phabricator.services.mozilla.com/D81375 |
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