https://bugs.kde.org/show_bug.cgi?id=380511
Bug ID: 380511
Summary: Commit e0a623414cfb34df8e3ae717d720f7a0f952b2c8
worsened scrolling behavior for both mice and
touchpads
Product: kirigami
Version: unspecified
Platform: Other
OS: Linux
Status: UNCONFIRMED
Severity: normal
Priority: NOR
Component: general
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: Not decided
Commit e0a623414cfb34df8e3ae717d720f7a0f952b2c8 was introduced to fix
https://bugs.kde.org/show_bug.cgi?id=376910. Before this commit, scrolling with
a mouse wheel was fine, but scrolling with a touchpad resulted in acceleration
being continuously increased.
With commit e0a623414cfb34df8e3ae717d720f7a0f952b2c8, scrolling with both a
mouse wheels and a touchpad results in the view scrolling one line at a time at
a constant speed.
For a mouse wheel, this is far too slow and ignores the systemwide setting
(System Settings > Input Devices > Mouse > Advanced > Mouse wheel scrolls by).
For a touchpad, this is still *effectively* too slow; it should scroll in
one-pixel increments, but with the speed determined by the speed of the finger
motion.
You can see the problem in Discover on a machine with Kirigami 2.1. The
scrolling behavior is poor for both input devices.
It was mentioned in https://bugs.kde.org/show_bug.cgi?id=376910 that the
QuickControls ScrollView has the correct behavior for both devices out of the
box in QT 5.9 onwards. QT 5.9 was just released a few days ago:
http://blog.qt.io/blog/2017/05/31/qt-5-9-released/
Maybe we should redirect our effort to use QT 5.9 which has appropriate
behavior rather than try to fix it manually and stay with an old QT version.
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