bug#65267: 30.0.50; modifying debug-ignored-errors during startup with --debug-init is broken

[Stefan Monnier]

> What about the minor changes below?  They do seem to yield the
> expected results in the original recipe.  The idea is to detect the
> situation where the init file _added_ to the value of
> debug-ignored-errors, and re-add the additions after loading the init
> file.

No objection from me (it's not great, but I don't think there's a great
solution).


        Stefan