287044 - Infinite loop scrolling listbox with long lines [@ nsEventListenerManager::HandleEvent ]

Status: RESOLVED DUPLICATE of bug 285449

(Core :: Layout, defect)

Description

[[e-mail]]

It's possible to create an infinite loop by scrolling a listbox that has some
very long lines. I don't claim to understand the listbox code but it needs to
keep the list of visible elements up to date. Now the problem occurs when only
the last visible element turns out to be wider than the listbox. Obviously the
listbox turns on the horizontal scrollbar which propmtly obscures the last
visible element. The listbox then decides to turn off the horizontal scrollbar,
and an infinite (well, not quite infinte due to stack overflow) loop ensues.

Comment 1

[[e-mail]]

Attachment: Test case - warning, can hang or even crash!

Also interesting are the circumstances under which it will paint the
overflow...

Comment 2

[Hermann Schwab]

Mozilla/5.0 (Windows; U; Win98; en-US; rv:1.8b2) Gecko/20050320
crash TB4498380X, TB4497771Y
http://talkback-public.mozilla.org/talkback/fastfind.jsp?search=2&type=iid&id=TB4498380X
http://talkback-public.mozilla.org/talkback/fastfind.jsp?search=2&type=iid&id=TB4497771Y

Comment 3

[Boris Zbarsky [:bzbarsky]]

roc, didn't I see you comment on some bug today with basically exactly the setup
described in comment 0?

Comment 4

[Robert O'Callahan (:roc) (email my personal email if necessary)]

bug 285449?

Comment 5

[[e-mail]]

*** This bug has been marked as a duplicate of 285449 ***