Create a file.txt of 1million characters on one line. Load into mozilla and try horizontal scrolling. Every once in a while the entire window will blink in black color while repainting. It depends on scrolling speed, happend when scrolling is fast. Happens on X11, I will try again on windows. Windows mozilla is much faster while scrolling than Linux. (don't try this with IE 5.0 :-)

Could you tell us what build you are using? Also please see the <a href="http:// www.mozilla.org/quality/bug-writing-guidelines.html">bug reporting guidelines</ a> for what type of information to give.

Build from daily snapshots. Latest files are from 20000-02-14.

worksforme on Win98 with M13, but I think you kind of already said that. Could someone test on Linux?

I tried a new build and bug is there... Linux Build ID: 2000021616

Marko.Macek@gmx.net: could you upload the file you used as an attachment to this bug please?

Why? I don't see the point of wasting the disk space with file containing a million A characters on one line. perl -e 'print "A" x 1000000, "\n"' will output the file.

Ok fair enough under Linux. But to the best of my knowledge NT doesn't come with perl as standard... Anyhow, I tried this out on a Feb 18th Linux build and did not see this. I presume you were viewing a local file?

reassigning browser-general bugs (again!) so triagers can find all the bugs with one query.

Still happens on Build: 2000022308. You have to scroll using the slider and do it fast enough. Scrolling using arrows or page left/right doesn't show the problem.

Marko.Macek@gmx.net , still seeing this? If so please update the component and owners to Layout.

Still easily reproduced on Linux build 2000032409.

reassign

Seems to be a Linux specific problem

Yes. There are a lot of 'black flash' repainting problems on Linux. Perhaps a tracking bug should be made for them.

Waqar can you take a look?.

This is due to that we do not set background on widgets. *** This bug has been marked as a duplicate of 28003 ***

This cannot be true because there are no black flashes when scrolling vertically! Even more I don't see what background color has to to with it?

Marking verified dup of 28003.

Reopening

This is my bug and it is a bug.

Mine.

It's interesting to note that I don't have this problem if I apply the patch that's in bug #28023. It's probably because we aren't setting the shell_window to black anymore. However, I wonder if this is a performance enhancement, anyway.

Well, it feels kinda snappier. I'm checking it in.

Checked in.

Just FYI I had to back this out since it was causing parts of the window not to be refreshed. Not sure why. The way to reproduce it is to find a page that is long ( or probably wide ) and scroll from side to side really quickly so that it will move more than a page at a time. Then move to another desktop and come back and the screen won't repaint. It looks like a problem with the mUpdateArea being 0x0 in size would cause the repaint size to be nothing.

Fixed in the July 14th build.