Good news: Confirmed I can reproduce the bug.
Bad news: The bug only happens in Unity8 and not in Mir demo servers.
What changed:
Xmir 2:1.18.4-1ubuntu4 adds accurate vscroll/touchpad support. So instead of
synthesising vscroll changes of any magnitude into fake button 4/5
press/releases, it now passes the vscroll float value straight down to the app.
This works well in Mir demo servers (with high-resolution touchpads
too), but in Unity8 Xmir ends up sending about 7 button 4/5 events per
mouse wheel tick.
It appears the flaw is in Qt/Unity8 code where a vscroll value of 1.0
(which means one mouse wheel tick) is not correctly maintaining the
vscroll value of 1.0 after it passes through Unity8.
So the Xmir change is correct, but this is at least the third Unity8/Qt
scrolling bug I've seen today. See also bug 1607223 and bug 1605513.
** Also affects: unity8 (Ubuntu)
Importance: Undecided
Status: New
** Changed in: xorg-server (Ubuntu)
Status: New => Invalid
** Also affects: qtmir (Ubuntu)
Importance: Undecided
Status: New
** Summary changed:
- [Xmir Firefox scrolling is too fast (mouse wheel) when run under Unity8
(since Xmir 2:1.18.4-1ubuntu4)
+ Xmir Firefox scrolling is too fast (mouse wheel) when run under Unity8 (since
Xmir 2:1.18.4-1ubuntu4)
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Packages, which is subscribed to xorg-server in Ubuntu.
https://bugs.launchpad.net/bugs/1607240
Title:
Xmir Firefox scrolling is too fast (mouse wheel) when run under Unity8
(since Xmir 2:1.18.4-1ubuntu4)
Status in qtmir package in Ubuntu:
Confirmed
Status in unity8 package in Ubuntu:
Confirmed
Status in xorg-server package in Ubuntu:
Invalid
Bug description:
Ubuntu 16.10 + proposed
Xmir 2:1.18.4-1ubuntu4
wheel mouse scrolling is too fast, tried with firefox and geany.
run firefox on mir scroll up/down some random long page using the
mouse wheel
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https://bugs.launchpad.net/ubuntu/+source/qtmir/+bug/1607240/+subscriptions
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