Multiple things in the app need the height of the header to be correct (for example, scrolling to a post), so we need the header offset calculation. However, we shouldn't be calculating it on scroll, it's too resource intensive and it causes flickering on iPads (and possible other devices too).
This commit removes header offset calculation on scroll and adds a one-time calculation as soon as the header is first rendered. This ensures that users get scrolled to the correct post even if they open it in a new tab.
Penar Musaraj
a96f22cd67