[TC 7.04a] Possible Lister bug

[Confucius]

Hello!

I've encountered with an odd Lister bug. When I scroll down any text file with both non-Cyrillic and Cyrillic letters in it with "Page Down" then everything works fine, but if I use mouse wheel instead of "Page Down" then some letters appear to be missing until I do a single click on the missing field or use Alt-Tab to switch back to the Lister.

I checked it twice and it seems that this problem appears only with Cyrillic text.

I'm using Windows XP Professional SP3 and TC 7.04a with no third-party add-ons installed.

Thank you!

P.S. I made some screenshots but I can not find an option to attach them to this post.

[ghisler(Author)]

I haven't heared of this problem so far. Could you try a different font? Maybe it's defective.

[wanderer]

2Confucius

I've seen such things in the past, in other programs. It could be a display-driver issue or another program interfering with lister or the display-driver.

For the screenshots, the only solution would be to upload them somewhere and post the links here.

[Confucius]

Hello!

I tried two different fonts and the problem still persists. I tested it on 3 different workstations with different video cards from different vendors. I think it isn't a display-driver issue, but maybe I'm wrong.

Again, this problem only occurs when I use mouse wheel instead of "Page Down" button. When I see missing letters, I press "Page Up" and "Page Down" to make them to reappear.

This is a temporary solution of course.

[DrShark]

2Confucius
I cannot confirm the bug.
Please upload a screenshot with problem to imageshack.us or another image hosting site.

[Confucius]

Hello!

Here are my screenshots.

With missing letters:
http://img231.imageshack.us/my.php?image=tc1mb4.jpg

When everything is fine:
http://img99.imageshack.us/my.php?image=tc2cu6.jpg

[DrShark]

I can confirm issues with scrolling.
Sample html file (inside archive): http://rapidshare.de/files/43951104/ListerIssueFile.zip.html
When scrolling from binary part of file:

Code: Select all

http://ati.amd.com
Voice: (905) 882-2600
Fax: (905) 882-2620
------------GCOyxAoB60e90Ogft1bQXv Content-Disposition: inline; filename=backgrnd.gif Content-Type: image/gif; name=backgrnd.gif 

with mouse wheel, down/up arrows and even pgup/pgdn.
Tested on:
TC 7.04a & TC 6.58
Windows XP SP2 Pro, Vista SP1 HP, Windows 7 Ultimate beta (all 32bit)
Ati & NVidia display adapters.

[ghisler(Author)]

Thanks for the sample file. This is a known limitation of Lister: It cannot handle large blocks of data without line breaks, because the line breaks are created dynamically when loading a part of the file around the current position: Lister then goes back up to a few kBytes until it finds the last line break, then uses this as a reference point for adding dynamic line breaks.

However, when there are no line breaks until the start of the buffer, the auto-added line breaks will not always be in the same position. No problem as long as you scroll forward, but you will get other line breaks when scrolling backwards.