Bug 515847

Summary: Rubberband selections can't keep up with the cursor.
Product: [Plasma] plasmashell Reporter: Fernando Marcelino Muniz <fernandommuniz>
Component: Desktop icons & Folder View widgetAssignee: Plasma Bugs List <plasma-bugs-null>
Status: REPORTED ---    
Severity: minor CC: akselmo, cwo.kde, hein, olib141
Priority: NOR Keywords: usability
Version First Reported In: 6.5.5   
Target Milestone: 1.0   
Platform: CachyOS   
OS: Linux   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:
Attachments: Issue in Plasma 6.5.5
This frame shows that its not just a visual issue.

Description Fernando Marcelino Muniz 2026-02-11 00:09:50 UTC
Created attachment 189450 [details]
Issue in Plasma 6.5.5

STEPS TO REPRODUCE
Drag a rubberband selection around.

OBSERVED RESULT
The rubberband selection lags behind the cursor, and so does its hitbox.

EXPECTED RESULT
The rubberband selection should have no delay.

SOFTWARE/OS VERSIONS
Operating System: CachyOS Linux 
KDE Plasma Version: 6.5.5
KDE Frameworks Version: 6.22.0
Qt Version: 6.10.2
Kernel Version: 6.18.9-2-cachyos (64-bit)
Graphics Platform: Wayland
Processors: 8 × 11th Gen Intel® Core™ i5-11300H @ 3.10GHz
Memory: 9 GB of RAM (8.1 GB usable)
Graphics Processor 1: Intel® Iris® Xe Graphics
Graphics Processor 2: NVIDIA GeForce GTX 1650
Manufacturer: LENOVO
Product Name: 82MG
System Version: IdeaPad Gaming 3 15IHU6
Comment 1 Fernando Marcelino Muniz 2026-02-11 00:10:50 UTC
Created attachment 189451 [details]
This frame shows that its not just a visual issue.
Comment 2 Akseli Lahtinen 2026-02-11 09:35:11 UTC
Can't repro this on KDE Linux

Operating System: KDE Linux 2026-02-11
KDE Plasma Version: 6.6.80
KDE Frameworks Version: 6.24.0
Qt Version: 6.10.2
Kernel Version: 6.18.7-zen1-1-zen (64-bit)
Graphics Platform: Wayland
Processors: 12 × AMD Ryzen 5 3600 6-Core Processor
Memory: 16 GiB of RAM (15.5 GiB usable)
Graphics Processor: AMD Radeon RX 6600
Comment 3 Oliver Beard 2026-02-11 21:32:03 UTC
Similarly, cannot reproduce.

Maybe there's a problem with laptops featuring both integrated and dedicated graphics cards?
Comment 4 cwo 2026-02-12 12:37:49 UTC
I can reproduce it on master, but only if I move the mouse very fast, and only on video - it's fast enough to appear correct in the ui, but if I look at individual frames I can see it desyncing, as if the rubberband was one frame behind.