Bug 413578 - if fractional display scaling is used, scrolling by dragging the scroll bar makes the icons flicker
Summary: if fractional display scaling is used, scrolling by dragging the scroll bar m...
Status: RESOLVED FIXED
Alias: None
Product: dolphin
Classification: Applications
Component: view-engine: icons mode (show other bugs)
Version: 19.08.2
Platform: Arch Linux Linux
: NOR normal
Target Milestone: ---
Assignee: Dolphin Bug Assignee
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2019-10-29 02:46 UTC by Patrick Silva
Modified: 2020-01-08 13:47 UTC (History)
2 users (show)

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

Attachments
demonstration (3.34 MB, video/webm)
2019-10-29 02:46 UTC, Patrick Silva 		Details
View All Add an attachment

Note You need to log in before you can comment on or make changes to this bug.
Description Patrick Silva 2019-10-29 02:46:09 UTC 
Created attachment 123554 [details]
demonstration

SUMMARY
Icons do not flicker if I scroll using the mouse wheel.

STEPS TO REPRODUCE
1. set display scaling factor to 1.2 in system settings > display and monitor > display configuration
2. restart plasma session
3. open Dolphin
4. scroll the files list by dragging the scroll bar

OBSERVED RESULT
icons flicker.

EXPECTED RESULT
icons do not flicker

SOFTWARE/OS VERSIONS 
KDE Plasma Version: 5.17.1
KDE Frameworks Version: 5.63
Qt Version: 5.13.1

ADDITIONAL INFORMATION
Watch the screen recording please.
Comment 1 Ardith Metz 2019-12-13 12:45:25 UTC 
I can confirm similar issue with the difference that it happens with both mouse wheel scroll and scrollbar. I use 1.5 scaling on Full HD (1980x1080) resolution.

I also found similar report on reddit:
https://old.reddit.com/r/kde/comments/chi715/flickering_when_scrolling_in_dolphin_kde/

SOFTWARE/OS VERSIONS 
KDE Plasma Version: 5.17.4
KDE Frameworks Version: 5.64.0
Qt Version: 5.13.2
Dolphin: 19.12.0

ADDITIONAL INFORMATION
Intel HD Graphics 620
Tested on both intel and modesetting ddx driver.
X11 session.
Comment 2 Ardith Metz 2020-01-08 13:47:54 UTC 
This issue seems fixed in the following setup (I think qt update to 5.14 and rebuild plasma against it was crucial):

SOFTWARE/OS VERSIONS 
KDE Plasma Version: 5.17.5
KDE Frameworks Version: 5.65.0
Qt Version: 5.14.0
Dolphin: 19.12.0