363216 - can't focus on listbox with keyboard after calling selectItem(-1)

Status: UNCONFIRMED

(Toolkit :: UI Widgets, defect)

Description

[Ori Avtalion (salty-horse)]

User-Agent:       Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9a1) Gecko/20061208 Minefield/3.0a1
Build Identifier: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9a1) Gecko/20061208 Minefield/3.0a1

After clearing out the listbox's selection using selectItem(-1), it cannot be selected again with the keyboard.

Reproducible: Always

Steps to Reproduce:
In the testcase:
1. Click on "Clear all"
2. Press shift-tab
Actual Results:  
The listbox is not selected.
An exception is printed to the error console:
Error: uncaught exception: [Exception... "Could not convert JavaScript argument"  nsresult: "0x80570009 (NS_ERROR_XPC_BAD_CONVERT_JS)"  location: "JS frame :: chrome://global/content/bindings/listbox.xml :: getIndexOfItem :: line 474"  data: no]

Expected Results:  
The list should be focused on the first item.

Comment 1

[Ori Avtalion (salty-horse)]

Attachment: Test-case

Comment 2

[Neil Deakin]

The actual bug here is that selectItem(-1) does anything. It should throw an exception. The correct syntax is selectItem(null)

Comment 3

[Ori Avtalion (salty-horse)]

Attachment: selectItem(null) test-case

If so, the "correct" selectItem(null) doesn't have any effect at all. See attached test-case.