Emacs widgets: buffer is not read-only in place where it should

[meblacky13]

Consider the following snippet:

    (progn
      (widget-create 'editable-field :size 8 :format "Birth date %v  
(dd/mm/yy)")
      (widget-setup))

This inserts in the current buffer the editable field widget:

    Birth date ________ (dd/mm/yy)

where the underscores denote the field's gray edit area.
Also, the whole buffer should be read-only, apart the edit area.

However putting the the cursor immediately before the parentheses, but  
still, out of the edit area, one can write and, most of all, can type  
"Enter" and break the widget in a very unpleasant way. This does not  
happen for the blank space on the left of the edit area.


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