Re: warning about undo info being discarded when in *Backtrace*

[Davis Herring]

> 3. For this particular warning, does it make sense to repeat the warning
> all? If undo was disabled in *Backtrace*, then it is still disabled, no? I
> might be mistaken here, however: It's possible that each warning was
> issued
> after the *Backtrace* was entered anew. The warning would presumably be
> issued only when undo was enabled and it became disabled.

When the undo info is discarded, undo remains enabled in the affected
buffer.  Future large changes thus cause it to be discarded again.

Davis

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