fix Tusky sometimes displaying empty tabs #5007
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Sometimes a tab is just empty after switching to it, but content appears as soon as you interact with it.
I found that setting a
offscreenPageLimit
on theViewPager2
makes that issue go away.This also has the side effect that the content of more tabs is preloaded, which makes tab switching feel different, one does not see so many loading spinners, content is just there instantly. I'm not sure if that is desireable but I would like to try it out for a while. If it happens to be a problem we can still move tab initialization to when it is actually visible.