253655 - overflow: auto + height/width: auto shows veritical scrollbars on content resize

Status: RESOLVED FIXED

(Core :: Web Painting, defect)

Description

[Martin Thomson]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.7) Gecko/20040707 Powersquid/0.9.2 (Firefox/0.9.2 polymorph)
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.7) Gecko/20040707 Powersquid/0.9.2 (Firefox/0.9.2 polymorph)

I have an image within a block that has "overflow: auto", "height: auto" and a
fixed width.  The image fits within the width allowed (that is, there is no
horizontal scrollbar).
If I then enlarge the image, the block is only enlarged vertically when the
width of the image remains less than the allowed width.

To put it another way, the contents of an "overflow: auto" box cannot increase
in such a way as to simultaneously add both vertical and horizontal scrollbars.

Reproducible: Always
Steps to Reproduce:
1. Box with width: 100px, overflow: auto, containing an image 80x80 pixels
2. double the size of the image


Actual Results:  
The box remains 80 pixels (approx) tall and it gains both horizontal and
vertical scrollbars.

Expected Results:  
The box should resize to the same dimensions as it would at the time of initial
page layout.  (height: 160px)  Only horizontal scrollbars should appear.

The width doesn't have to be set explicitly, the width of the browser window is
a sufficient constraint.

Resizing the browser window reflows the page, which solves the problem.

I assume that resizing other sorts of fixed size content would have the same
effect (<pre> tags etc).

Comment 1

[Martin Thomson]

Attachment: A simple test case, reload to reset.

Comment 2

[Jesiah S]

I see this on LInux 2004101705

Comment 3

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

fixed by the patch in bug 240276

Comment 4

[Steve England [:stevee]]

Testcase fails for me in Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US;
rv:1.8b2) Gecko/20050422 Firefox/1.0+
Testcase WFM Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.8b2)
Gecko/20050428 Firefox/1.0+

Resolved Fixed by bug 240276?