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33d5845991
When the 'loading slider' navigation indicator is enabled, and a connection is very slow, we `display: none` most of the page and display a spinner. The `still-loading` body class for this was being added in the `afterRender` step in the Ember runloop. This meant that, depending on the order they were scheduled, other `afterRender` jobs may run before it. This caused an issue with topic scroll locations because we would attempt to scroll to an element which was `display: none` at the point its position was calculated. This commit moves the `still-loading` class manipulations to the `render` step of the runloop, which is technically more correct, and means that anything scheduled in the `afterRender` step is guaranteed to run without the `display: none` CSS. https://meta.discourse.org/t/276305/29