451200 - <select> with disabled <option> changing value without changing display

Status: RESOLVED DUPLICATE of bug 387406

(Core :: Layout: Form Controls, defect)

Description

[Sam Beard]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.16) Gecko/20080702 Firefox/2.0.0.16
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.16) Gecko/20080702 Firefox/2.0.0.16

using the following example, when the selected option of a select is disabled,  if you mouseover the list and leave with another option highlighted but not selected, when the select looses focus, the value of the select changes to the highlighted option.  The onchange is fired but the displayed option text is NOT updated.  This happens if FireFox 2 and 3.  In Firefox 3 but not 2, when another control like the button in the example is clicked, the changed value is displayed.

<form id="form">
  <select id="select" onchange="alert(this.value);">
    <option value="0" selected disabled>Option 0</option>
    <option value="1">Option 1</option>
    <option value="2">Option 2</option>
    <option value="3">Option 3</option>
    <option value="4">Option 4</option>
  </select>
  <br>
  <input type="button" value="What's Selected" onclick="alert(form.select.value)">
</form>


Reproducible: Always

Steps to Reproduce:
1. Start with a selected option disabled (does not matter if by html or script)
2. Drop down the list
3. Mouseover and leave with an option other than the selected option highlighted
4. Click elsewhere on the page - the onchange will fire but the displayed text will not.
5.In Firefox 3, click on another control and the displayed text will update.


Expected Results:  
1. The selected option should not change unless the user selects it, the browser should never change the value in a field on its own.
2. The displayed value should always match the selected value.

Comment 2

[Nickolay_Ponomarev]

A similar testcase from a duplicate bug: https://bugzilla.mozilla.org/attachment.cgi?id=402057

I can reproduce with that testcase on Mozilla/5.0 (Macintosh; Intel Mac OS X 10.5; rv:2.0b6pre) Gecko/20100901 Firefox/4.0b6pre

Mats, seeing that you've fixed a few bugs with <select>, perhaps you'll be interested in this?