627138 - Page redraws unnecessarily if select tag contains more options than are visible

Status: RESOLVED WORKSFORME

(Firefox :: General, defect)

Description

[Steve Gullion]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2.13) Gecko/20101203 Firefox/3.6.13 ( .NET CLR 3.5.30729; .NET4.0E)
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2.13) Gecko/20101203 Firefox/3.6.13 ( .NET CLR 3.5.30729; .NET4.0E)

If I insert (via Ajax) a select tag on a page, which select tag 1) allows for multiple select, 2) displays three items (size="3"), and 3) has more than three total options, so that the vertical scroll is active, the entire page repaints (an ugly flash). The page is fairly complex, and the select is inside a table cell. The html in question (the table and a couple of wrapper divs) is also being loaded into a div via Ajax. 

Removing the select eliminates the redraw. If the select has all options visible, that eliminates the redraw.

My ugly workaround is to hide the outermost div on load and use setTimeout to fade it in after 300ms. It works and isn't noticeable to the user. Would be nice if it weren't necessary.

Reproducible: Always

Steps to Reproduce:
See details.
Actual Results:  
Page flash and repaint.

Expected Results:  
Smooth fade in of loaded element

Comment 1

[(mostly gone) XtC4UaLL [:xtc4uall]]

Can you provide a reduced Testcase showing the Issue and attach it to this Report?
Also, can you test against a recent Nightly Build (http://nightly.mozilla.org/)?

Comment 2

[Steve Gullion]

Update: I tested this in 4.0 Beta 9 and the code worked as expected; i.e., the bug is no longer present. Don't know what the priority is for fixing 3.6+ bugs, but I'll mark it resolved.

Comment 3

[(mostly gone) XtC4UaLL [:xtc4uall]]

Setting WFM in this Case unless you want to pinpoint a certain Checkin fixing this by checking past Trunk Nightly Builds.