In some cases, error dialogs may end up below other windows and stay
unnoticed because of how dialogs are raised and hidden on various
platforms. This is not very constructive. It's much better to make sure
one sees an error when it happens (in some cases, it may mean possible
data loss, so it should be at least acknowledged; also seeing it later
may mean you can't know anymore which action triggered this error,
making the whole process kind of meaningless and hard to debug).
So anyway, let's make error messages prominent by having them always
above.
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