bug#10382: 24.0.92; gratuituous `file-supersession' error for `menu-bar-update-hook'

[Lars Ingebrigtsen]

"Drew Adams" <drew.adams@oracle.com> writes:

>> I think we'll need a backtrace at the time of the "really edit
>> the buffer?" prompt in order to debug this.  Tho, I suspect 
>> it won't be easy to get one since this is in the middle of 
>> menu-bar-update-hook, so redisplay might be inhibited.
>
> Right.  I don't know how to obtain that.  And as I said, this does not seem to
> happen all the time.

`debug-on-message' might help here.

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