Public bug reported:

current build number: 403
device name: arale
channel: ubuntu-touch/rc-proposed/meizu.en

Test Case:
1. Boot the phone and unlock it
2. Shake it (I'm on apps scope by default if it matters)
3. Scroll the page up and down

Expected result
Scrolling works as expected, page goes up/down

Actual result
The dash is like frozen. A right edge swipe works and clears the problem up.

The following records are logged in unity8.log

[...]
[2016-08-17:18:18:37.829] qtmir.sensor: Screen::onOrientationReadingChanged
[2016-08-17:18:18:37.832] qtmir.sensor: Screen::customEvent - new orientation 8 
handled
[2016-08-17:18:18:39.119] qtmir.sensor: Screen::onOrientationReadingChanged
[2016-08-17:18:18:39.122] qtmir.sensor: Screen::customEvent - new orientation 1 
handled
[2016-08-17:18:18:54.957] qtmir.surfaces: MirSurfaceItem(unity8-dash) - Got a 
QEvent::TouchBegin while there's still an active/unfinished touch sequence.
[2016-08-17:18:20:42.033] qtmir.sensor: Screen::onOrientationReadingChanged
[2016-08-17:18:20:42.036] qtmir.sensor: Screen::customEvent - new orientation 8 
handled
[2016-08-17:18:20:42.849] qtmir.sensor: Screen::onOrientationReadingChanged
[2016-08-17:18:20:42.853] qtmir.sensor: Screen::customEvent - new orientation 1 
handled

<Here I do a right edge swipe>

[2016-08-17:18:20:45.100] qtmir.surfaces: 
MirSurface[0x1670f10,"unity8-dash"]::updateActiveFocus() unfocused
[2016-08-17:18:20:45.217] [PERFORMANCE]: Last frame took 89 ms to render.
[2016-08-17:18:20:45.295] [PERFORMANCE]: Last frame took 35 ms to render.
[2016-08-17:18:20:46.037] [PERFORMANCE]: Last frame took 88 ms to render.
[2016-08-17:18:20:46.271] qtmir.surfaces: 
MirSurface[0x1670f10,"unity8-dash"]::updateActiveFocus() focused
[2016-08-17:18:20:46.298] qtmir.clipboard: D-Bus GetContents - returning 0 bytes

** Affects: canonical-devices-system-image
     Importance: Undecided
         Status: New

** Affects: unity8 (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: regression-proposed

** Attachment added: "unity8.log"
   https://bugs.launchpad.net/bugs/1614163/+attachment/4722729/+files/unity8.log

** Also affects: unity8 (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1614163

Title:
  unity8 stops processing touch input events after shaking the phone

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