[Wayland-bugs] [Bug 104080] extra straight line when drawing with stylus

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=104080

--- Comment #5 from Carlo Caione <carlo at caione.org> ---
> That commit shouldn't have fixed the issue because the pen should be handled 
> by the tablet backend, not the mouse/keyboard one. Which indicates something 
> else is amiss here.

Odd, I bisected down to that commit myself and at least on my setup that commit
is fixing the issue I'm seeing.

Please note that on this hardware we are forcing ID_INPUT_TOUCHSCREEN=1 with:

ENV{ID_BUS}=="usb", ENV{ID_VENDOR_ID}=="22b9", ENV{ID_MODEL_ID}=="0005",
ATTR{[dmi/id]product_name}=="EC10IS1", ENV{ID_INPUT}="1",
ENV{ID_INPUT_TABLET}="", ENV{ID_INPUT_TOUCHSCREEN}="1"



I'm going to attach (in the next messages) the evemu logs obtained when drawing
a straight line, lifting the stylus, and drawing a new straight line starting
at a different point. When the issue is visible the end of the first line and
the start of the second line are connected by a line even though I lifted the
stylus.

The two logs are obtained:
1) using an old libinput v1.6.3 where the problem is reproducible
2) using the latest libinput v1.9.3 where the commit 8c55bc060df seems to have
solved this issue

Also please note that Ubuntu is shipping this patch
https://lists.freedesktop.org/archives/wayland-devel/2015-September/024171.html
that solves the same issue for older versions of libinput (I guess it was
merged some time in the past).

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