279386 - Selection flickers when trying to select the text from the bottom upward

Status: RESOLVED WORKSFORME

(Core :: Web Painting, defect)

Description

[Joël Kuiper]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8b) Gecko/20050122 Firefox/1.0+
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8b) Gecko/20050122 Firefox/1.0+

on http://www.uruviel.com/test/informatie.htm the selection of text flickers and
is sometimes incorrect when moving from the bottom of the text upward.
The site uses a z-index to position the text above some transparent gif
backgrounds used in a LI element.



Reproducible: Always

Steps to Reproduce:
1.http://www.uruviel.com/test/informatie.htm
2.Select text from bottom upward
3.

Actual Results:  
The text flickers 

Expected Results:  
It should be smooth

Comment 1

[djpohly]

Also seeing this with Firefox 1.0, FWIW.

Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.5) Gecko/20041107 Firefox/1.0

Comment 2

[djpohly]

Attachment: Fairly minimal testcase

Looks like the absolute positioning could be at fault.	When you're selecting,
the selection only flickers a specified distance, and that distance is equal to
the amount of stuff sitting above the div.  It seems that for a split second
the browser thinks your mouse is (for example) at position (50px,50px) in the
webpage rather than (50px,50px) inside the div.

Comment 3

[Joël Kuiper]

Bug seems to disappear when adding a font-family.
That's probably why I haven't seen this alot in the wild

Comment 4

[Boris Zbarsky [:bzbarsky]]

Over to view rendering for the flicker and event targeting issue...

I can't reproduce this in a GTK1 Linux build, though.

Comment 5

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

I can't reproduce on Linux GTK2 either.

Comment 6

[Joël Kuiper]

Must have been resolved by some fix...