414979 - Middle clicking list to scroll the page starts selection

Status: NEW

(Core :: Layout: Form Controls, defect)

Description

[u286998]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9b3pre) Gecko/2008013004 Minefield/3.0b3pre
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9b3pre) Gecko/2008013004 Minefield/3.0b3pre

Middle clicking a selection list does not only initiate page scrolling but also selection of the elements.

Reproducible: Always

Steps to Reproduce:
1. Visit https://bugzilla.mozilla.org/show_bug.cgi?id=76010 (or any other bug with many ccs)
2. Middle click the select element
3. Move the mouse to scroll
Actual Results:  
The page scrolls but the selection is also started.

Expected Results:  
Elements in the list should not be selected.

Comment 1

[Lucas Malor (mail: c6kfnkn2uc AT snkmail DOT c0m)]

Confirmed. Anyway I don't know how much is dangerous, on the contrary. I propose a WONTFIX.

Comment 2

[Mats Palmgren (inactive)]

Confirming bug.  Also, middle-click in combobox menu have similar bug.

Comment 3

[Boris Zbarsky [:bzbarsky]]

Odd.  nsListControlFrame does have IsLeftButton() checks scattered about...

Comment 4

[Emil Ivanov]

Attachment: testcase

I cant reproduce this bug with:
Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.3a1pre) Gecko/20091027 Minefield/3.7a1pre

Comment 5

[Boris Zbarsky [:bzbarsky]]

This was in the right component before.  I have no idea why you decided to move it...

Comment 6

[Emil Ivanov]

Well because it was caused by "mouse action", that's why I thought it was for events. But if you say it was a mistake then I apologize.