Bug 442759

Summary:	Scrolling with touchpad is not based on the action/speed of scrolling
Product:	[Applications] okular	Reporter:	strangequark <random1123581321>
Component:	general	Assignee:	Okular developers <okular-devel>
Status:	REPORTED ---
Severity:	wishlist	CC:	nate
Priority:	NOR
Version First Reported In:	20.12.2
Target Milestone:	---
Platform:	Other
OS:	Microsoft Windows
Latest Commit:		Version Fixed In:
Sentry Crash Report:

Description strangequark 2021-09-21 04:05:02 UTC

SUMMARY
While scrolling with touchpad, the amount scrolled is not based on the speed/acceleration of how you're scrolling, it just scrolls by a fixed amount. It would be nice to have scrolling that depends on what speed the person is scrolling, and not jerky like it is now. 

STEPS TO REPRODUCE
1. Scroll with touchpad

OBSERVED RESULT
The scrolling of the document happens jerkily, and by a fixed amount every time. If you're scrolling very slowly, then it scrolls a lot of lines, pauses, and scrolls again.

EXPECTED RESULT
Smooth scrolling, where the speed of scrolling is dependent on the speed by which you're scrolling with the touchpad

SOFTWARE/OS VERSIONS
Windows: 10.0.19043 Build 19043, Microsoft Windows 10 Home


ADDITIONAL INFORMATION
none

Comment 1 Laura David Hurka 2021-09-21 07:38:58 UTC

I agree that stepwise scrolling is not good for touchpad use. Okular usually has per-pixel scrolling, so it should follow touchpad input directly. The problem here is probably related to using Okular on Windows. I don’t know much about Windows.

Anyways, did you install Okular from the Microsoft Store, or somehow else?

(Probably irrelevant: does it change if you toggle the Use Smooth Scrolling option in Settings -> Configure Okular...?)

Comment 2 strangequark 2021-09-22 12:01:38 UTC

Sorry, I should have clarified about Windows. I run neon too, and the touchpad scrolling works smooth there.
I installed Okular from the Microsoft Store.
About Smooth Scrolling, it was enabled by default, and disabling it leads to the exact same behaviour as before except that the scrolling is instantaneous, and not animated. The bug is that the animation while scrolling (that is, the 'smooth' part) is there, but it doesn't actually follow the touchpad speed.