280822 - dragging object with javascript leaves trail

Status: NEW

(Core :: DOM: Core & HTML, defect, P5)

Description

[Jonathan]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8b) Gecko/20050202
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8b) Gecko/20050202

The URL http://www.hypergurl.com/messagecursor.html gives an example of a
javascript that moves text along with the cursor. In Mozilla a slight trail,
made up of fragments of what is being dragged, is left.

Reproducible: Always

Steps to Reproduce:
1. Go to http://www.hypergurl.com/messagecursor.html
2. Move cursor slowly from left to right


Actual Results:  
A trail, made up of fragments of what is being dragged, is left behind

Expected Results:  
Left no residual trail

More image fragments are left if you move the mouse at a slower rate, therefore
it is possible that the bug involves a periodic problem within the rendering engine.

For the record, I hope nobody actually implements this bit of javascript... it's
quite annoying, but the principles behind the script may be useful elsewhere.

Comment 1

[Jonathan]

Solving this, may also solve the following bug
https://bugzilla.mozilla.org/show_bug.cgi?id=112958

I submitted mine as seperate because the bug 112958 seemed to assume it was an
issue with GTK.

Comment 2

[Martijn Wargers (dead)]

This is not a recent regression. I can see the bug with Mozilla1.7 and Mozilla1.4.

Comment 3

[Boris Zbarsky [:bzbarsky]]

I can't reproduce this with a GTK1 build, even with NS_PAINT_SEPARATELY defined.

Martijn, do you have a debug build?  If so, could you enable paint flashing and
see whether we're repainting the areas where the turds get left?

Comment 4

[Martijn Wargers (dead)]

Attachment: Testcase

Maybe you're seeing it with this? Otherwise it may depend on the font you use.
Probably the same issue as bug 96041, not?

Comment 5

[Ben Fowler]

Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; en-US; rv:1.8b) Gecko/20050203
Firefox/1.0+

I am seeing this with the test case (but not the original case)

Comment 6

[Stephen Donner [:stephend] Not actively reading bugmail]

Setting bug status to confirmed, as I see this with the current Seamonkey trunk
build on Windows XP.

Comment 7

[Boris Zbarsky [:bzbarsky]]

Yeah, with the testcase I see it.  The testcase is definitely bug 79732, though.

Comment 8

[Firefox Bug Husbandry Bot]

https://bugzilla.mozilla.org/show_bug.cgi?id=1472046

Move all DOM bugs that haven’t been updated in more than 3 years and has no one currently assigned to P5.

If you have questions, please contact :mdaly.

Comment 9

[Stephen Donner [:stephend] Not actively reading bugmail]

Mass-removing myself from cc; search for 12b9dfe4-ece3-40dc-8d23-60e179f64ac1 or any reasonable part thereof, to mass-delete these notifications (and sorry!)