https://bugs.kde.org/show_bug.cgi?id=420492
Bug ID: 420492 Summary: 20.04.0 significantly slows down mouse scrolling Product: okular Version: 20.04.0 Platform: Archlinux Packages OS: Linux Status: REPORTED Severity: normal Priority: NOR Component: general Assignee: okular-devel@kde.org Reporter: dragonrmar...@gmail.com Target Milestone: --- SUMMARY 20.04.0 update breaks fast scrolling in Okular. Most noticeable with a "hyperscroll" mouse wheel. STEPS TO REPRODUCE 1. open any PDF or EPub file in 20.04.0 2a. with a hyperscroll mouse, free scroll the mouse wheel inside the document panel 2b. with a normal mouse, scroll as fast as possible inside the document window 3. downgrade to 1.9.3 and repeat step 2 OBSERVED RESULT Scrolling the same amount of clicks scrolls down less lines in 20.04.0 compared to 1.9.3. Scrolling with a hyperscroll wheel significantly limits the speed of scrolling to make free scrolling unusable. This bug is only observed when scrolling in the document panel. Scrolling in the navigation panel or in the scrollbar on the right produces the expected scroll speed. EXPECTED RESULT The scroll speed in the document panel is as fast as in the other panels and keeps the same speed as 1.9.3 SOFTWARE/OS VERSIONS Windows: macOS: Linux/KDE Plasma: (available in About System) KDE Plasma Version: 5.18.4.1-1 KDE Frameworks Version: 5.69.0 Qt Version: 5.14.2 (built against 5.14.2) ADDITIONAL INFORMATION Mouse: Logitech G502 with free scroll also tested with a generic mouse with normal scroll wheel videos of the scrolling attached: https://youtu.be/wIts9r-meME https://youtu.be/nfDjuFkjQLE -- You are receiving this mail because: You are the assignee for the bug.