Reported today by a member of my forum:
I also often see a similar problem when clicking on the cog in the editor:
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Regarding the user completion, I thought we had code that checked for offscreen at the top on that @tgxworld?
The mobile case is different.
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Seems to be working OK for me in both desktop and mobile. @ChrisBeach How did you trigger those case? 
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Easy repro is on iPhone, if you click gear prior to composer going full screen with safari hack
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