0a22502c34
The current algorithm triggers a bug in Xwayland when two devices have different granularity of scrolling. In Xwayland, the scroll increment is 1 and all physical devices scroll through the same (x)wayland pointer device. This may cause events to get lost when changing devices: - mouse scrolls by full increment, current value is 1.0 last scroll button was sent for valuator value 0.0, delta is 1.0 and we emulate a button event. - touchpad scrolls by partial increment, current value is 1.3 last scroll button was sent for valuator value 1.0, delta is 0.3 and no button event is emulated - mouse scrolls by full increment, current value is -0.7, last scroll button was sent for valuator value 1.0, delta is -0.7 and no button event is emulated Thus the wheel event appears to get lost. Xwayland cannot reliably detect this case because we don't see the physical devices. We can work around this by instead emulating buttons whenever we cross a multiple of increment. However, this has a drawback: high-resolution scroll devices can now trigger a button event storm by jittering across the multiple of increment. e.g. in the example above the touchpad moving from 1.3 to 1.0 would cause a click, despite this being a third of an increment. Fixes #1339 Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net> Acked-by: Olivier Fourdan <ofourdan@redhat.com>
X Server
The X server accepts requests from client applications to create windows, which are (normally rectangular) "virtual screens" that the client program can draw into.
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