Bug 505150 - moving the cursor paints a false lines (on monitor)
Summary: moving the cursor paints a false lines (on monitor)
Status: RESOLVED DUPLICATE of bug 502103
Alias: None
Product: kolourpaint
Classification: Applications
Component: general (other bugs)
Version First Reported In: 25.04.1
Platform: Flatpak Linux
: NOR minor
Target Milestone: ---
Assignee: kolourpaint-support
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2025-06-03 06:33 UTC by Ole U.K
Modified: 2025-06-15 23:04 UTC (History)
1 user (show)

See Also:
Latest Commit:
Version Fixed In:
Sentry Crash Report:

Attachments
Image of the odd cursor behavior, using a Monitor whit laptop. (using HDMI cable) the bug is not there on the laptop screen only on monitor. (194.26 KB, image/png)
2025-06-03 06:33 UTC, Ole U.K 		Details
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Description Ole U.K 2025-06-03 06:33:55 UTC 
Created attachment 181986 [details]
Image of the odd cursor behavior, using a Monitor whit laptop. (using HDMI cable)
the bug is not there on the laptop screen only on monitor.

Bug: Brush paints a false/incorrect line when moving the cursor.

KolourPaint: 25.04.1
KDE Frameworks: 6.13.0
Qt: Using 6.9.0 and built against 6.9.0
KDE Flatpak runtime (Wayland)
Build ABI: x86_64-little_endian-lp64
Kernel: linux 6.14.9-300.fc42.x86_64
Comment 1 Ole U.K 2025-06-03 13:02:17 UTC 
Comment on attachment 181986 [details]
Image of the odd cursor behavior, using a Monitor whit laptop. (using HDMI cable)
the bug is not there on the laptop screen only on monitor.

PC:
Operating System: Fedora Linux 42
KDE Plasma Version: 6.3.91
KDE Frameworks Version: 6.14.0
Qt Version: 6.9.0
Kernel Version: 6.14.9-300.fc42.x86_64 (64-bit)
Graphics Platform: Wayland
Processors: 12 × AMD Ryzen 5 6600H with Radeon Graphics
Memory: 32 GiB of RAM (30.0 GiB usable)
Graphics Processor 1: AMD Radeon 660M
Graphics Processor 2: NVIDIA GeForce RTX 3060 Laptop GPU
Manufacturer: LENOVO
System Version: Legion 5 15ARH7H
Comment 2 John Kizer 2025-06-15 05:00:46 UTC 
Hi - could you please check if you're using fractional display scaling (ex. 125%, 150%, etc.) on the monitor where you're seeing this issue? Thanks!
Comment 3 Ole U.K 2025-06-15 09:03:10 UTC 
Bug Report: Fractional Scaling Issue at 125%

Hey,

Yes, I am using fractional scaling (125%) on my monitor. There are no issues when using fractional scaling at 100% and 150%; the problem only occurs at 125%.

I also tried using fractional scaling (125%) on my laptop screen, and the same problem was present.
Comment 4 John Kizer 2025-06-15 21:01:47 UTC 
Thanks! And sorry, I forgot to also ask - does scrolling or resizing the window in some way, so that its contents are redrawn, cause those graphical artifacts to disappear?
Comment 5 Ole U.K 2025-06-15 21:35:43 UTC 
hei,
Graphical artifacts are visible only at 100% zoom.
Artifacts disappear when resizing or moving the window.
Artifacts disappear when zooming in or out from 100% zoom.
Artifacts disappear when i move the mouse cursor to the color palette, but not if i move the mouse cursor to tool bar.
Comment 6 John Kizer 2025-06-15 23:04:02 UTC 
Thank you! That's enough to confirm that we're both experiencing the exact same issue, and I believe that this and one other bug report share the same root cause - merging those together to hopefully help with developer investigation :-) Thanks!

*** This bug has been marked as a duplicate of bug 502103 ***