Comment 1 for bug 1607240
Revision history for this message
| Daniel van Vugt (vanvugt) wrote Re: [Xmir Firefox scrolling is too fast (mouse wheel) when run under Unity8 (since Xmir 2:1.18.4-1ubuntu4) | #1 |
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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.