bug#19270: 25.0.50; make PDF mode in EWW customizable

[Ivan Shmakov]

>>>>> Stefan Monnier <monnier@iro.umontreal.ca> writes:

 >>> IOW, maybe adding configurability to EWW is good in itself, but I
 >>> think your use case would be better served by a config elsewhere,
 >>> which would cover EWW as well as other cases where we might want to
 >>> view PDF files.

 >> How would that help if EWW will still launch doc-view-mode for any
 >> PDF files going through it?

 > I don't understand: did you maybe fail to notice the "which would
 > cover EWW" in my message above?

        Somehow, I’ve interpreted that as “EWW is covered already,”
        which is contrary to my observations.  Sorry for the noise.

        Otherwise, indeed, relying on the mailcap.el facilities there
        may be the way to go.  I guess that might require some work,
        though.  (As in: allow the user to choose among the several
        handlers provided for a given Content-Type:.)

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