839871 - An absolute position block is invisible when inside a columned block with non-static position

Status: RESOLVED FIXED

(Core :: Layout, defect)

Description

[James Holderness]

Attachment: Test case

User Agent: Mozilla/5.0 (Windows NT 6.0; rv:18.0) Gecko/20100101 Firefox/18.0
Build ID: 20130201065344

Steps to reproduce:

I created a div with position:absolute nested inside another div with position:relative with -moz-column-count:1.

The outer block doesn't have to be relative positioned - anything other than static (or inherit) produces the same result. And the column-count doesn't specifically have to be 1 - another column-count value or setting the column-width instead will work just as well.


Actual results:

The content of the nested div was invisible. Inspecting it through the developer console showed a width and height of zero. Specifically setting the width and height of the divs didn't make any difference.


Expected results:

I would have expected the content of the nested div to be visible and to have a non-zero width and height. It works as expected in Safari and I think it used to work in one of the previous versions of Firefox (although I'm not positive about that).

Comment 1

[(mostly gone) XtC4UaLL [:xtc4uall]]

Confirmed using Mozilla/5.0 (Windows NT 6.1; WOW64; rv:21.0) Gecko/20130210 Firefox/21.0 ID:20130210031150

Regression Windows:

MC:
Last good nightly: 2012-02-10
First bad nightly: 2012-02-11

Pushlog: http://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=fb81c9a433e4&tochange=d71dab82fff4

MI:
Last good nightly: 2012-02-10
First bad nightly: 2012-02-11

Pushlog: http://hg.mozilla.org/integration/mozilla-inbound/pushloghtml?fromchange=363fa033d483&tochange=742ae4efad72


ESR 10 Branch:
10.0.2 ESR (good)
http://hg.mozilla.org/releases/mozilla-esr10/rev/14af4fac0bc5

10.0.3 ESR (bad)
http://hg.mozilla.org/releases/mozilla-esr10/rev/26f11b3e7226

Pushlog: http://hg.mozilla.org/releases/mozilla-esr10/pushloghtml?fromchange=14af4fac0bc5&tochange=26f11b3e7226

=> due to a backported Security Fix?!

Comment 2

[Mats Palmgren (inactive)]

This change is in all three regression windows above:

053d3cc103cb	Scott Johnson — Bug 718516: Replace call of FinishReflowWithAbsoluteFrames() with FinishAndStoreOverflow() for nsColumnSetFrame to prevent crash. [r=ehsan]

Comment 3

[Mats Palmgren (inactive)]

I guess it's a variation of bug 724978.

Comment 4

[(mostly gone) XtC4UaLL [:xtc4uall]]

(In reply to Mats Palmgren [:mats] from comment #3)
> I guess it's a variation of bug 724978.

Confirmed fixed with Mozilla/5.0 (Windows NT 6.1; WOW64; rv:22.0) Gecko/20130325 Firefox/22.0 ID:20130325093524 CSet: 4d3250f3afea