[Wayland-bugs] [Bug 108306] Double-tap Suppressed by Debounce in VM Guest

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108306

            Bug ID: 108306
           Summary: Double-tap Suppressed by Debounce in VM Guest
           Product: Wayland
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: XWayland
          Assignee: wayland-bugs at lists.freedesktop.org
          Reporter: freedesktop.org at kevin.kleinfelter.com
        QA Contact: xorg-team at lists.x.org

Created attachment 141962
  --> https://bugs.freedesktop.org/attachment.cgi?id=141962&action=edit
Mouse Event Trace

Fast double-taps get treated as a single click.

Behavior is present in libinput 1.10.4-1 but not in 1.8.2-1ubuntu2. (I haven't
tried the versions in between.)  Still present in 1.12.0-1.

I think this is similar to https://bugs.freedesktop.org/show_bug.cgi?id=105974
with different hardware.

I'm trying to run Ubuntu 18.04 in a VMware Fusion guest on a Macbook host.  If
I double-tap the trackpad fast, it gets treated as a single-click in Ubuntu. 
If I double-tap slow (but not too slow) it gets treated as a double-click. 
Hitting the narrow window is hard!  This makes it tough to run X in a VM on a
Macbook.

I suspect that the host hardware+software delivers a synthesized double-click
to the guest, and that the time between the clicks is very small.

evemu-record shows two "VirtualPS/2 VMware Virtual Mouse" devices and a "VMware
VMware Virtual USB Mouse".  Capture of the first of these is attached.  It
looks to me like the second tap comes 8 ms after the first, and I'm betting
that is treated as bounce.

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