166397 - {inc}textarea affects main window horizontal scroll bar while editing

Status: RESOLVED WORKSFORME

(Core :: Layout: Block and Inline, defect, P2)

Description

[Ian]

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

While editing some data in a textarea box that contains a full page of data it
sometimes scrolls the windows page.

Reproducible: Always

Steps to Reproduce:
1 - Create an html page containing a pre that makes the data go past the right
margin - I will attach a sample file.
2 - Place cursor in the textarea box scroll down a couple lines - (Place cursor
to row 3 col 0)<BR>
3 - While holding the shift key press the down arrow to highlight the whole line<BR>
4 - Now hit delete

Actual Results:  
After the line is deleted the window textarea box gets aligned to the left
causing the browser to scroll to the right.

Expected Results:  
Expecting that the line would get deleted and that is it

Comment 1

[Ian]

Attachment: Sample html file to show show the bug.

Comment 2

[Ian]

Another weird bug. - I know I should file another however it may somehow be
related to this one.

In the form supplied (see attachement) place mouse at the top of the selection
box. - now start highliting the data while moving the mouse down. Move the mouse
down all the way to the bottom of the page as far as possible, you should notice
that after the window start to scroll as well. Eventually the window stops
scrolling and the textarea box is no longer visible. At this time the scroller
is now jammed. It cannot be moved up. The only way arround this is to reload the
window.

Comment 3

[Alexandru Savulov]

reporter,

thanks for the testcase. can you remember on which site did you encountered this
bug? it would be helpfull to prioritize this bug. 

Comment 4

[Boris Zbarsky [:bzbarsky]]

happens on Linux too.

Comment 5

[Ian]

RE: Comment #3 

We have an internal form that we use for updating a text. It is not available to
the outside world.

It seem to only affect pages where the horizontal scroll bar exist. Since this
mostly only happens in reports using wide tables and output using <PRE> (In our
case we were using <PRE> at the bottom of the page to display some debugging
information) I would not say that this bug will occur too frequently. I beleive
the people that will encounter this bug the most will be developpers. IE: On
Coldfusion, their debugging information can showup at the bottom of the page and
they use <PRE> to display this so if a developper is trying to debug a page
containing a textarea, there is a high change that he/she will encounter this bug.

Comment 6

[Alexandru Savulov]

hmm, let's see if we can get to this one. is a layout bug, so we should repair
it anyway.

Comment 7

[David Baron :dbaron: (⌚️UTC-4, no longer working on Mozilla)]

Hmm, rather nasty incremental reflow bug here.

Comment 8

[Steve England [:stevee]]

Testcase hangs both:
- Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.9a1) Gecko/2006120606 Minefield/3.0a (pre-reflow branch)
- Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.9a1) Gecko/2006120804 Minefield/3.0a1 (post-reflow branch)

So unable to test against reflow branch landing.

Comment 9

[Mats Palmgren (inactive)]

WFM, SeaMonkey 2006120701 (pre reflow branch) and 2006120801 (post) on Linux.
Performance when editing the text in the testcase seems ok on Linux.

Steve, could you file a new bug the perf problem on Windows so we can track
that independently from this bug. Thanks.

Comment 10

[Steve England [:stevee]]

Will do mats, just regression-range finding atm.

Comment 11

[Steve England [:stevee]]

Filed bug 363381

Comment 12

[Mats Palmgren (inactive)]

Thanks Steve.  So, if you disable spell checking is this bug WFM?

Comment 13

[Steve England [:stevee]]

I see no change in the behaviour of the testcase with:
- Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.9a1) Gecko/2006120606 Minefield/3.0a (pre-reflow branch)
- Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.9a1) Gecko/2006120804 Minefield/3.0a1 (post-reflow branch)

Concur with comment 9

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