Windowed mode: hover events in the right edge area are not propagated to the application

[Andrea Bernabei]

=== Environment ===
current build number: 174
device name: frieza
channel: ubuntu-touch/rc-proposed/bq-aquaris-pd.en
last update: 2016-08-25 11:12:19
version version: 174
version ubuntu: 20160825
version device: 20160809.0
version custom: 20160805--42-20-vivid

=== Unity8 version ===
8.14+15.04.20160819-0ubuntu1

=== Description ===
It seems maximized applications do not receive hover events when the mouse is close to the right edge, in an area about 0.5GU wide

=== How to reproduce (one of the many ways) ===
0) Make sure the M10 is in "Desktop mode"
1) Download the UITK gallery from the app store
2) Launch it
3) Maximize the app
4) Open a scrollable page, such as Colours
5) Move the mouse to the right edge to reveal the scrollbar

=== Expected result ===
The scrollbar receives hover events over its whole area

=== Actual result ===
The scrollbar does not receive mouse events in the rightmost area, i.e about 0.5GU from the right edge. As a consequence, it appears as not being hovered even when the mouse is inside the right half of the thumb

=== Cause ===
This is probably caused by the component handling the edge push eating hover events.
ltinkl said that the EdgePush component has "hoverEnabled: true". That is probably why hover events are not getting propagated down to the app.
Hover events in QtQuick are propagated to parents, not to siblings.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.