up arrow behaviour
Strange behaviour of up and down arrow makes mixed arrow/scrollwheel navigation a bit confusing.
The up arrow seems to not move to the "next unopened item" in the list, but to the "first item in the list that is visible in the current viewable area".
Let's say I am scrolling a long list of items: some are visible on screen, some titles are up (outside of the viewable list), some are down: if I open a post, its title wil be aligned to the top of viewable area.
If then I scroll the page a bit up, revealing headlines of previous posts, then click the up arrow (^), the post whose headline is first in the viewable list is opened, rather then the one immediately preceding the open one.
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Mike Castle commented
I think if you click into the body of the current post you're reading, this will work as intended (at least it does for up/down arrows). I think this might be a simple tweak in the JS to keep focus correct. I've seen many apps act this way in the past as well, and eventually get fixed.