Button: long press, then release, is not registered as a click

The implementation amounts to MouseArea { onClicked: clicked() } so this seems to be a general MouseArea upstream issue.

It is not, it is our fault that we also implement MouseArea.pressAndHold, which on long press turns the clicked signal off

This bug was fixed in the package ubuntu-ui-toolkit - 1.3.1627+15.10.20150908-0ubuntu1

---------------
ubuntu-ui-toolkit (1.3.1627+15.10.20150908-0ubuntu1) wily; urgency=medium

  [ Zsombor Egri ]
  * Implement list item expansion.
  * Turn AdaptivePageLayout page creation to be asynchronous.
  * Fix ListItem swipe handling when gesture is initiated over an overlay
    MouseArea which does not accept pressed event. Fixes LP: #1484545
  * AbstractButton to C++. Fixes LP: #1365471, LP: #1458028
  * Haptics singleton moved to C++.
  * ActionItem moved to C++.
  * Making columns resizable in an AdaptivePageLayout.
  * Introducing column configuration into AdaptivePageLayout.

  [ Benjamin Zeller ]
  * Fix build inside qt and shadowbuild.

  [ Tim Peeters ]
  * Remove old and unused header-related files, and update unit test filenames.
  * Don't unset the subheader style when Page.head changes because that unsets
    the parent of Page.head.contents. Fixes LP: #1488922
  * Fix the theming of the MainView.
  * Fix the background color of the overflow panel.

  [ Christian Dywan ]
  * Include change signals with arguments in .api.
  * A public QML type with no version is an error. Rather than silently breaking
    as QML does normally at least apicheck can make this fatal.
  * UbuntuShape shouldn't emit redundant deprecation warnings. Fixes LP: #1481791
  * Update .bzrignore to new upstream style layout. Fixes LP: #1433308
  * Revert unnecessary change of Popover minimumWidth. Fixes LP: #1483708

  [ Ken VanDine ]
  * Fixed a few typos in the api docs for StateSaver.

  [ Olivier Tilloy ]
  * Take custom key indexes into account to allow sorting on custom roles.
    Fixes LP: #1485674

  [ Albert Astals Cid ]
  * Properly free shapeTextures[index] The old code assumes that the UbuntuShape
    will still be around when the opengl context is destroyed, but that seldom
    happens so connect the signal to a lambda that will be there and does the
    cleanup properly. Without this patch testDirectionalDragArea from unity8 was
    hitting the qFatal because it ran out of space in shapeTextures.

  [ Richard Huddie ]
  * Remove all usage of the autopilot simulated keyboard when the OSK is being
    used. Fixes LP: 31483668

  [ Gerry Boland ]
  * Compensate for Qt's device pixel ratio multiplier.
    Fixes: LP: #1207270, LP: #1275748, LP: #1468402

  [ Nick Dedekind ]
  * Added relative date time i18n.

  [ CI Train Bot ]
  * Resync trunk.

 -- Zoltan Balogh <email address hidden> Tue, 08 Sep 2015 04:10:50 +0000