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

From: Lars Ingebrigtsen
Subject: bug#19085: 25.0.50; eww: text fields and undo
Date: Tue, 02 Feb 2016 16:30:39 +1100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.0.90 (gnu/linux)

Lars Ingebrigtsen <address@hidden> writes:

> Ah, I see it now.  The bug is actually when doing `M-t' after the last
> word in the field.  Which should just signal an error instead of doing
> anything.  I wonder why it's not doing that -- the "Seach" button should
> be read-only...

It's rather fascinating.  If you insert this into a buffer and then
`M-t' between the words (with debugging switched on):

(insert "foo " (propertize "bar\nzot" 'read-only t))

You'll get a buffer with

bar foobar

while showing the backtrace.  But continuing restores what was there,
because it's called in `atomic-change-group' form.

However, when doing the restoration, the `after-change-functions'
function isn't run, so eww doesn't restore the length.  Is that a bug in

(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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