bug#43218: EWW handles default answer incorrectly when changing a select

[Nicolas Graner <nicolas.graner@universite-paris-saclay.fr>]

Lars Ingebrigtsen <larsi@gnus.org> a écrit le 05/09/2020 à 15h51 :
> Either would work...  I chose to supply a default value.

The fix works in most situations but not when several options have the
same value.
Example:

--------------------------------------------------
<form method="post">
<select name="a">
<option value="1">one</option>
<option value="1">two</option>
</select>
</form>
--------------------------------------------------

Activate the select and change its value to 'two'.
Activate it again and answer <RET> to the prompt for value: the
displayed value returns to 'one'.

This is not critical as this situation is rare and the value sent to the
server will be correct anyway, but it is confusing to the user who does
not usually know the value of each option.

Nicolas