bug#19226: eww.el desktop support fixes: autoload eww-mode, use inhibit-read-only

[Ivan Shmakov]

>>>>> Glenn Morris <rgm@gnu.org> writes:

 > Come to think of it, desktop mode could solve this itself:

 > When restoring foo-mode, if foo-mode is not bound, try requiring foo.
 > That would solve this case and many others.

        Yet will leave some unsolved.  Such as, for instance, my own
        zealous-save-mode, defined in 'zealsave.

 > For a complete solution, when desktop saves a major/minor mode to
 > restore, it could also save the name of the library that defines the
 > mode.

        How would it obtain such information?  Especially if the user
        has modified the -mode function code and used eval-defun to
        redefine it.  (That’s also what I do at times.)

 > When restoring, first of all require that library.

        And fail miserably should the library be renamed.

        Moreover, “general purpose” modes are ought to be autoloaded
        anyway.  I see no reason to second-guess this case at the least.

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