143966 - It's possible to scroll past the last row in this listbox

Status: VERIFIED WORKSFORME

(SeaMonkey :: Preferences, defect)

Description

[Håkan Waara]

This is reproduced on RC2.

STEPS TO REPRODUCE:

1. Open Preferences
2. Go to the "System" panel
3. Look at the "file types" listbox, and scroll it

EXPECTED RESULTS: you shouldn't be able to scroll past the last row

ACTUAL RESULT: the scrollbar or row count is somehow messed up, so you can
scroll past the last row.

Note: this might be a listbox core bug, but I'll try the Preferences component
for now.

Comment 1

[mental]

This happens in the Calendar's unifinder as well, so am guessing it is a listbox
issue.  CC'ing mikep so that he's aware of this issue and any forthcoming fix.

Comment 2

[Shane Caraveo]

Easy to reproduce.  Create a listbox like:
<listbox id="associationList" flex="1"
    hidecolumnpicker="true" seltype="single">
    <listhead>
        <listheader label="Patterns" flex="1" class="treecell-header outset"/>
    </listhead>
    <listcols>
        <listcol flex="1"/>
    </listcols>
</listbox>

Now, use js to add elements via the listbox.addItem function.

1. you cannot select the first item.
2. you can scroll about 10 times further than there are rows.

Adding a single empty listitem element to the listbox xul above is a workaround.
 This requires me to add code to work around a bug, would love to see this one
fixed.

Comment 3

[Daniel Wang]

I cannot reproduce the bug with 1.6a 2003092604/win98SE build. Reporter  (Håkan
Waara), can you still reproduce the bug?

Comment 4

[Andreas Kunz]

WFM