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(widget)editable-field

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The `editable-field' Widget
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   Syntax:

     TYPE ::= (editable-field [KEYWORD ARGUMENT]... [ VALUE ])

   The VALUE, if present, is used to initialize the `:value' property.
The value should be a string, which will be inserted in field.  This
widget will match all string values.

   The following extra properties are recognized:

`:size'
     The width of the editable field.
     By default the field will reach to the end of the line.

`:value-face'
     Face used for highlighting the editable field.  Default is
     `widget-field-face', see Note: User Interface.

`:secret'
     Character used to display the value.  You can set this to e.g. `?*'
     if the field contains a password or other secret information.  By
     default, this is nil, and the value is not secret.

`:valid-regexp'
     By default the `:validate' function will match the content of the
     field with the value of this attribute.  The default value is `""'
     which matches everything.

`:keymap'
     Keymap used in the editable field.  The default value is
     `widget-field-keymap', which allows you to use all the normal
     editing commands, even if the buffer's major mode suppresses some
     of them.  Pressing <RET> invokes the function specified by
     `:action'.