Mostly stop page jumps when resolving or reopening issues.
Review Request #613 — Created April 30, 2017 and updated — Latest diff uploaded
|5, 2, 6|
When clicking the Fixed, Discard, or Reopen button, the updating of the issue summary table can cause the page's scroll position to change. We had code in place that intended to address this, but this was very dependent on the order in which the browser updates the pages and calculates positions. The old code assumed it could safely get the old scroll position after triggering DOM updates, but this wasn't a good assumption and no longer works in Chrome or Firefox. We now fetch this value before performing any DOM updates, and we also now set the scroll position in an animation frame. This is done in an attempt to more closely tie the scroll position update with the DOM update. While not necessary on Chrome or Firefox, it does reduce the chances quite a bit of jumping on Safari and Internet Explorer (though it will happen at times). There is a very slight jump that's still noticeable in Firefox, but it's actually unrelated to this logic. There are some heights/positions in the review request box that are using subpixels, which affect rendering as the issue summary table changes height. Those will be dealt with separately. Testing Done: Tested in Chrome, Firefox, Safari, and Edge. Chrome works the best. There's absolutely no jump or perceived shift in rendering when clicking any issue buttons now. Firefox works mostly well, but as the issue summary table changes height, subpixels elsewhere in the UI affect rendering. This is noticed as a slight shift in horizontal lines, with the scroll position staying exactly the same on every click. Safari mostly stays in place when clicking buttons, but does sometimes have a quick jump. I have not been able to eliminate this entirely, but `requestAnimationFrame` reduces the occurrence. Internet Explorer has both the sub-pixel bug and the occasional jump (again, reduced by `requestAnimationFrame`, but otherwise mostly stays in place. Reviewed at https://reviews.reviewboard.org/r/8906/
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