184023 - Selection of large numbers of items in a multiple selection window freezes UI temporarily

Status: RESOLVED DUPLICATE of bug 183918

(Core :: Layout: Form Controls, defect)

Description

[Loren Williams]

User-Agent:       Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.2.1) Gecko/20021130
Build Identifier: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.2.1) Gecko/20021130

Selecting lots (too many?) items in a multiple selection box of a form make the
UI pause for a few (3-5 ish) seconds.  Occurs on KDE and GNOME bug pages (the
only ones I could think of with really large selection windows).  See steps to
reproduce.



Reproducible: Always

Steps to Reproduce:
At the KDE bugs page, select the first product listed and scroll to the bottom.
 Shift-click to select all of the products, then try to do highlight an item
somewhere else.  There will be a long (in "internet time") wait before the
highlighting occurs.
Actual Results:  
The UI temporarily froze.

Expected Results:  
The amount of time to process the highlighting was inordinately long.  Mozilla
should have been able to select the items without giving a noticeable delay.

Comment 1

[Boris Zbarsky [:bzbarsky]]

*** This bug has been marked as a duplicate of 183918 ***

Comment 2

[Jesse Glick]

Note that unlike in Bug 183918, selecting a single item here is fast. However I
can reproduce the longish delay (several seconds) when selecting a large block.