sagecell
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Don't erase old output before the new one is ready
See http://ask.sagemath.org/question/33024/prevent-sagemathcell-from-clearing-output-window/
Perhaps don't make it the default, though: If you leave the old output there while the new input is displayed above, the screen is in an inconsistent state. If for some reason the network is delayed a bit, you could end up with a "wrong answer" being displayed for quite a while.
The spinner showing computation in progress should be much more obvious, I think - like big and in the middle of the page. Then it would be clear that what is shown is not quite what it should be.
Ignore this commit reference. Just figuring out how to get commits to show in issues in another repository.