bug#19085: 25.0.50; eww: text fields and undo

[Mark Oteiza]

This is sort of two related issues.

First, text fields are barely usable as it stands:

1. M-x eww RET foo RET
2. tab to duckduckgo search field
3. C-k

Point is now beyond the search field. Putting point on the text inside
the search field and trying to delete it (C-d) seems to delete the field
itself, so it's still possible to delete the entry field.

Next, because eww-mode has (buffer-disable-undo), it is impossible to undo
edits.  It is troublesome because one cannot undo accidentally
deleting part of the web page, further because it is
impossible to undo edits in text fields.

Off the top of my head, fields for text entry are perfectly fine in
"customize" and "notmuch".



In GNU Emacs 25.0.50.1 (x86_64-unknown-linux-gnu, X toolkit, Xaw scroll bars)
 of 2014-11-16 on logos
Repository revision: 058f56d24f776bdc25bcac86fe1f8969a78374e9
Configured using:
 `configure --prefix=/usr --sysconfdir=/etc --libexecdir=/usr/lib
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 'CFLAGS=-march=x86-64 -mtune=generic -O3 -pipe -fstack-protector-strong
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Configured features:
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Important settings:
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Major mode: Lisp Interaction

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Recent messages:
Loading /home/mvo/.cache/emacs/custom.el (source)...done
Loading /home/mvo/.emacs.d/site-lisp/loaddefs.el (source)...done
For information about GNU Emacs and the GNU system, type C-h C-a.

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Memory information:
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