bug#16211: eww should support multiple *eww* buffers

[Ivan Shmakov]

        One another issue, – the following plist-put does nothing, as
        it’s evaluated while still in the url.el “data buffer” (for
        which eww-data is most likely nil):

   208  (defun eww-render (status url &optional point buffer)
…
   212    (let* ((headers (eww-parse-headers))
…
   223           (data-buffer (current-buffer)))
   224      (unwind-protect
   225          (progn
   226            (plist-put eww-data :title "")

        The plist-put calls down that progn are evaluated after
        eww-display-*, and thus after either eww-setup-buffer or some
        other set-buffer.  The eww-use-external-browser-for-content-type
        case I’m unsure about, though.

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