Child window leaving fullscreen when move mouse to bottom right corner of screen

see attached video for example

This bug was fixed in the package unity8 - 8.15+17.04.20170308-0ubuntu1

---------------
unity8 (8.15+17.04.20170308-0ubuntu1) zesty; urgency=medium

  [ Albert Astals Cid ]
  * Let's follow the keyboard order
  * Enable the license check (LP: #1590044)
  * Show a barebones error message if loading the QML doesn't work
  * Make sure cursor is back to normal when closing the window (LP:
    #1666158)
  * Fix small warning when sensitive is undefined
  * Remove unused member variable
  * Initialize m_msecsSinceReference
  * Add warning if registerService fails
  * Move menus Component {} out of the repeater
  * Add tool to browse menus of a running app

  [ Daniel d'Andrada ]
  * Drag child windows with Alt+LeftMouseButton (LP: #1664947)

  [ Gerry Boland ]
  * TopLevelWindowModel: connect to the OSK surface to know when it goes
    away so we can clean up after it. (LP: #1670681)

  [ Josh Arenson ]
  * Initialize sessionMode to single when mock is reset (LP: #1667463)

  [ Lukáš Tinkl ]
  * Make the menu string "Back" translatable
  * Let the OSK be driven by a switch in indicator-keyboard (LP:
    #1521518)
  * Disable the tutorial when there's no touchscreen (LP: #1661557)
  * Shell chrome fixes (LP: #1658117, #1665723, #1665724, #1669010)
  * Cancel the drag as soon as we're entering the spread (LP: #1668642)
  * Fix being unable to use window control buttons or menus with touch
    (LP: #1667604, #1668387)

  [ Michael Terry ]
  * Set QT_IM_MODULE in the greeter so that the OSK can come up. (LP:
    #1670383)
  * Simplify our startup handling of Mir environment variables and set
    the right socket path in snappy.

  [ Michael Zanetti ]
  * Cancel the home key activation if something else is pressed along
    with Meta (LP: #1670678)
  * close the drawer when something is launched from the launcher (LP:
    #1660367)
  * use a svg instead of a png for the Launcher's BFB (LP: #1668057)
  * change the default setting for the launcher autohiding (LP:
    #1670655)

  [ Nick Dedekind ]
  * Split up Shell::test_spreadDisabled to ensure initial state for each
    test.

 -- Michał Sawicz <email address hidden> Wed, 08 Mar 2017 09:56:46 +0000