175959 - "PNG Alpha Mask Demo" locks scroll bars and freezes window

Status: RESOLVED WORKSFORME

(Core :: Graphics: ImageLib, defect)

Description

[Norman Megill]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.1) Gecko/20020826
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.1) Gecko/20020826

This demo freezes the window when the bird is dragged too far to right in a
certain way.  It does not freeze the browser, and a simple reload will recover
the window, so it is a minor problem.

Reproducible: Always

Steps to Reproduce:
1. Open referenced URL.
2. Drag the bird to the right, pulling it _past the edge of the window_ (i.e. do
it without touching the horizontal scroll bar).
3. As the horizontal scrollbar resizes and the bird jumps back, drag it to the
right again _past the edge of the window_ without touching the horizontal scroll
bar.  Keep repeating.

Actual Results:  
When horizontal scroll bar is about 10% of screen width, it locks and cannot be
moved, nor the bird dragged back.  The window seems to be frozen.  The only
recovery seems to be to reload the URL.

Expected Results:  
It seems to me that freezing the window is not intended design behavior.  Note
that the bird can dragged arbitrarily far to the right if, in conjunction with
carefully manipulating the horizontal scroll bar, the bird is never allowed to
leave the window, in which case the window never seems to freeze.

Comment 1

[Mats Ekberg]

Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.2b) Gecko/20021017

I can reproduce this bug. Also, I tried to open the page in a tab. After the
page froze, I could still close the tab and continue as usual.

Comment 2

[julius ross]

I cannot reproduce this on Mac OSX (build 2002101612)

Comment 3

[Patrick Xia]

Confirming based on comment 1 and reproducibility on Linux.

Setting OS to 'all'.

Comment 4

[Torben]

I also see this, build 2002110708, win95. Since this has to do with images, I am
sending it to ImageLib, hope someone there knows where it belong.

Comment 5

[Patrick Xia]

bug's still here... 2003012110

Comment 6

[Matthew Elvey]

I ran into this too (same thing when you drag quickly down).
1.2 on XP. (Hey there fellow fastmail user.)
Needs to be changed from NEW to confirmed by someone with rights...

Comment 7

[Patrick Xia]

NEW is confirmed - I confirmed this 2002-10-22
Bugs start in an UNCONFIRMED state.

Comment 8

[Patrick Xia]

Doesn't happen when you move the sun, though.

Comment 9

[Bobby Holley (:bholley)]

I can't reproduce this on a firefox nightly. Also, I can't reproduce the behavior of the bird jumping back. Can someone confirm that this is still an issue on firefox? Otherwise I'll mark it WFM (don't think it's an imagelib bug anyway).

Comment 10

[Bas Schouten (:bas.schouten)]

Seems to work just fine for me. As far I can tell from the bug hasn't been seen in 8 years.