Bug 475316 - KColorChooser does not display the color hovered over on the screen, but is able to select it.
Summary: KColorChooser does not display the color hovered over on the screen, but is a...
Status: NEEDSINFO WAITINGFORINFO
Alias: None
Product: kcolorchooser
Classification: Applications
Component: general (other bugs)
Version First Reported In: 23.08.1
Platform: Arch Linux Linux
: NOR normal
Target Milestone: ---
Assignee: Unassigned bugs
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2023-10-07 12:34 UTC by Mouth
Modified: 2025-09-25 07:03 UTC (History)
1 user (show)

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


Attachments
1_KColorChooser_no_live_update (1.64 MB, video/webm)
2025-09-25 07:02 UTC, Mouth
Details
2_app_example_with_live_update (3.40 MB, video/webm)
2025-09-25 07:03 UTC, Mouth
Details

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Description Mouth 2023-10-07 12:34:54 UTC
SUMMARY
KColorChooser does not display the color hovered over on the screen, but is able to select it.
Plasma is launched under Wayland, I've tried it on "Wayland" and "XWayland" applications and the result is identical.

STEPS TO REPRODUCE
1. Use KDE Under Wayland session
2. run kcolorchooser

OBSERVED RESULT
-

EXPECTED RESULT
-

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Arch Linux 
KDE Plasma Version: 5.27.8
KDE Frameworks Version: 5.110.0
Qt Version: 5.15.10
Kernel Version: 6.5.5-arch1-1.1 (64-bit)
Graphics Platform: Wayland
Graphics Processor: Mesa Intel® HD Graphics 630

ADDITIONAL INFORMATION
screencast : https://imgur.com/a/beSi2ge
kcolorchooser : 23.08.1-1 (arch)
Comment 1 Nate Graham 2025-09-10 07:11:23 UTC
Can you clarify what you mean by "display the color hovered over on the screen"? Maybe a screen recording would help to illustrate the problem.

Thanks!
Comment 2 Bug Janitor Service 2025-09-25 03:46:50 UTC
🐛🧹 ⚠️ This bug has been in NEEDSINFO status with no change for at least 15 days. Please provide the requested information, then set the bug status to REPORTED. If there is no change for at least 30 days, it will be automatically closed as RESOLVED WORKSFORME.

For more information about our bug triaging procedures, please read https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging.

Thank you for helping us make KDE software even better for everyone!
Comment 3 Mouth 2025-09-25 06:46:26 UTC
In KColorChoose, the vertical preview rectangle that should display the color under the cursor does not update in real time while hovering over the screen. Currently, the preview only changes after a left-click, which means the color is not shown live during cursor movement.

Expected behavior :

The vertical preview rectangle should update immediately and automatically to reflect the pixel color under the cursor, without requiring a mouse click.

Actual behavior :

The preview rectangle remains unchanged until the user performs a left-click.
This completely breaks the eyedropper / precise color-picking function, since you can’t verify the color before clicking.
Comment 4 Mouth 2025-09-25 07:02:52 UTC
Created attachment 185237 [details]
1_KColorChooser_no_live_update
Comment 5 Mouth 2025-09-25 07:03:17 UTC
Created attachment 185238 [details]
2_app_example_with_live_update
Comment 6 Mouth 2025-09-25 07:03:35 UTC
(The problem still exists since the initial publication of the bug Report.)

OS: Arch Linux x86_64
Kernel: Linux 6.16.8-2-cachyos
Display (DELL G2724D): 2560x1440 in 27", 165 Hz
DE: KDE Plasma 6.4.5
WM: KWin (Wayland)
CPU: AMD Ryzen 7 7840HS (16) @ 5.14 GHz
GPU: AMD Radeon 780M Graphics [Integrated]