319207 - Reflow of table with style "margin-right: auto;" creates unneeded horizontal scrollbar

Status: RESOLVED WORKSFORME

(Core :: Layout, defect)

Description

[Thomas Andrews]

User-Agent:       Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; en-US; rv:1.8) Gecko/20051111 Firefox/1.5 www.thomasoandrews.com
Build Identifier: Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; en-US; rv:1.8) Gecko/20051111 Firefox/1.5 www.thomasoandrews.com

In the above page, if you select a different value in the <select> control, it causes the application to resize the containing table so that a horizontal scrollbar is added to the application.

The select does not resize.  But for some reason, a reflow of the HTML is triggered, and DOM Inspector shows the containing table to go off the screen to the right.

Reproducible: Always

Steps to Reproduce:
1. Choose another value in the <select> menu


Actual Results:  
A horizontal scrollbar shows up in the application window, as if it is resized to be too wide for the screen.

Expected Results:  
No change should occur in the reflow.

It also occurs on Windows.

Comment 1

[Samuel Sidler (old account; do not CC)]

Happens in FF 1.5/Win as well.

Comment 2

[Bill Gianopoulos [:WG9s]]

Confirming with Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9a1) Gecko/20051202 Firefox/1.6a1 ID:2005120206.

Changing OS to all.

Comment 3

[Samuel Sidler (old account; do not CC)]

Also happens in Camino.

-> Core

Comment 4

[Thomas Andrews]

Interestingly, the redraw also occurs if you open a link on the page in a new tab.

Comment 5

[Thomas Andrews]

Correction, if you have no tabs open, it redraws with the scrollbar if you open a link in the new tab, assuming you have 'hide tabs when there is only one tab' set.

Comment 6

[Thomas Andrews]

Okay, this has nothing to do with <select> per se.

In fact, you can reproduce it with the example at:

http://www.thomasoandrews.com/examples/mozilla/sizing/nonselect.html

If you resize your window without changing the window's width, just its height, you can induce the bug.  That's why creating a new tab in the previous comments showed the problem - it amounted to resizing the window without changing the width.

You can do this by manually resizing, or you can show or hide a toolbar (which resizes the height but not width of the display window.)  For some reason, this isn't 100%, but if it doesn't work by showing a hidden toolbar, you can probably reproduce it by hiding the toolbar.

Comment 7

[Thomas Andrews]

Attachment: A minimalist example

Load the attachment, then choose a toolbar to show or hide via the 'View/Toolbars" menu.  You should see the horizontal scrollbar.  You might have to show then hide a toolbar before the scrollbar appears.

Comment 8

[j.j.]

WFM

Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9a2pre) Gecko/20061231 Minefield/3.0a2pre

Comment 9

[Bill Gianopoulos [:WG9s]]

I can no longer reproduce this with

Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9a2pre) Gecko/20070102 Minefield/3.0a2pre ID:2007010204 [cairo]

My guess is this was fixed by the reflow branch landing.