tst_controls Dialog tests fail on offscreen platform

FAIL!  : tst_controls::Basic::Dialog::test_layout() property active
   Actual   (): false
   Expected (): true
   Loc: [/home/qt/work/qt/qtquickcontrols2/tests/auto/controls/data/tst_dialog.qml(89)]
FAIL!  : tst_controls::Basic::Dialog::test_qtbug71444() property active
   Actual   (): false
   Expected (): true
   Loc: [/home/qt/work/qt/qtquickcontrols2/tests/auto/controls/data/tst_dialog.qml(89)]
FAIL!  : tst_controls::Basic::Dialog::test_reject() property active
   Actual   (): false
   Expected (): true
   Loc: [/home/qt/work/qt/qtquickcontrols2/tests/auto/controls/data/tst_dialog.qml(89)]
QWARN  : tst_controls::Basic::Dialog::test_reject() QQmlEngine::setContextForObject(): Object already has a QQmlContext
FAIL!  : tst_controls::Basic::Dialog::test_reject() Compared values are not the same
   Actual   (): 1
   Expected (): 2
   Loc: [/home/qt/work/qt/qtquickcontrols2/tests/auto/controls/data/tst_dialog.qml(161)]
FAIL!  : tst_controls::Basic::Dialog::test_signals(Ok) property active
   Actual   (): false
   Expected (): true
   Loc: [/home/qt/work/qt/qtquickcontrols2/tests/auto/controls/data/tst_dialog.qml(89)]
FAIL!  : tst_controls::Basic::Dialog::test_signals(Open) property active
   Actual   (): false
   Expected (): true
   Loc: [/home/qt/work/qt/qtquickcontrols2/tests/auto/controls/data/tst_dialog.qml(89)]
FAIL!  : tst_controls::Basic::Dialog::test_signals(Save) property active
   Actual   (): false
   Expected (): true
   Loc: [/home/qt/work/qt/qtquickcontrols2/tests/auto/controls/data/tst_dialog.qml(89)]
FAIL!  : tst_controls::Basic::Dialog::test_signals(Cancel) property active
   Actual   (): false
   Expected (): true
   Loc: [/home/qt/work/qt/qtquickcontrols2/tests/auto/controls/data/tst_dialog.qml(89)]
FAIL!  : tst_controls::Basic::Dialog::test_signals(Close) property active
   Actual   (): false
   Expected (): true
   Loc: [/home/qt/work/qt/qtquickcontrols2/tests/auto/controls/data/tst_dialog.qml(89)]
FAIL!  : tst_controls::Basic::Dialog::test_signals(Discard) property active
   Actual   (): false
   Expected (): true
   Loc: [/home/qt/work/qt/qtquickcontrols2/tests/auto/controls/data/tst_dialog.qml(89)]
FAIL!  : tst_controls::Basic::Dialog::test_signals(Apply) property active
   Actual   (): false
   Expected (): true
   Loc: [/home/qt/work/qt/qtquickcontrols2/tests/auto/controls/data/tst_dialog.qml(89)]
FAIL!  : tst_controls::Basic::Dialog::test_signals(Reset) property active
   Actual   (): false
   Expected (): true
   Loc: [/home/qt/work/qt/qtquickcontrols2/tests/auto/controls/data/tst_dialog.qml(89)]
FAIL!  : tst_controls::Basic::Dialog::test_signals(RestoreDefaults) property active
   Actual   (): false
   Expected (): true
   Loc: [/home/qt/work/qt/qtquickcontrols2/tests/auto/controls/data/tst_dialog.qml(89)]
FAIL!  : tst_controls::Basic::Dialog::test_signals(Help) property active
   Actual   (): false
   Expected (): true
   Loc: [/home/qt/work/qt/qtquickcontrols2/tests/auto/controls/data/tst_dialog.qml(89)]
FAIL!  : tst_controls::Basic::Dialog::test_signals(SaveAll) property active
   Actual   (): false
   Expected (): true
   Loc: [/home/qt/work/qt/qtquickcontrols2/tests/auto/controls/data/tst_dialog.qml(89)]
FAIL!  : tst_controls::Basic::Dialog::test_signals(Yes) property active
   Actual   (): false
   Expected (): true
   Loc: [/home/qt/work/qt/qtquickcontrols2/tests/auto/controls/data/tst_dialog.qml(89)]
FAIL!  : tst_controls::Basic::Dialog::test_signals(YesToAll) property active
   Actual   (): false
   Expected (): true
   Loc: [/home/qt/work/qt/qtquickcontrols2/tests/auto/controls/data/tst_dialog.qml(89)]
FAIL!  : tst_controls::Basic::Dialog::test_signals(No) property active
   Actual   (): false
   Expected (): true
   Loc: [/home/qt/work/qt/qtquickcontrols2/tests/auto/controls/data/tst_dialog.qml(89)]
FAIL!  : tst_controls::Basic::Dialog::test_signals(NoToAll) property active
   Actual   (): false
   Expected (): true
   Loc: [/home/qt/work/qt/qtquickcontrols2/tests/auto/controls/data/tst_dialog.qml(89)]
FAIL!  : tst_controls::Basic::Dialog::test_signals(Abort) property active
   Actual   (): false
   Expected (): true
   Loc: [/home/qt/work/qt/qtquickcontrols2/tests/auto/controls/data/tst_dialog.qml(89)]
FAIL!  : tst_controls::Basic::Dialog::test_signals(Retry) property active
   Actual   (): false
   Expected (): true
   Loc: [/home/qt/work/qt/qtquickcontrols2/tests/auto/controls/data/tst_dialog.qml(89)]
FAIL!  : tst_controls::Basic::Dialog::test_signals(Ignore) property active
   Actual   (): false
   Expected (): true
   Loc: [/home/qt/work/qt/qtquickcontrols2/tests/auto/controls/data/tst_dialog.qml(89)]
FAIL!  : tst_controls::Basic::Dialog::test_spacing(content) property active
   Actual   (): false
   Expected (): true
   Loc: [/home/qt/work/qt/qtquickcontrols2/tests/auto/controls/data/tst_dialog.qml(89)]
FAIL!  : tst_controls::Basic::Dialog::test_spacing(header,content) property active
   Actual   (): false
   Expected (): true
   Loc: [/home/qt/work/qt/qtquickcontrols2/tests/auto/controls/data/tst_dialog.qml(89)]
FAIL!  : tst_controls::Basic::Dialog::test_spacing(content,footer) property active
   Actual   (): false
   Expected (): true
   Loc: [/home/qt/work/qt/qtquickcontrols2/tests/auto/controls/data/tst_dialog.qml(89)]
FAIL!  : tst_controls::Basic::Dialog::test_spacing(header,content,footer) property active
   Actual   (): false
   Expected (): true
   Loc: [/home/qt/work/qt/qtquickcontrols2/tests/auto/controls/data/tst_dialog.qml(89)]
FAIL!  : tst_controls::Basic::Dialog::test_spacing(header,footer) property active
   Actual   (): false
   Expected (): true
   Loc: [/home/qt/work/qt/qtquickcontrols2/tests/auto/controls/data/tst_dialog.qml(89)]
FAIL!  : tst_controls::Basic::Dialog::test_spacing(header) property active
   Actual   (): false
   Expected (): true
   Loc: [/home/qt/work/qt/qtquickcontrols2/tests/auto/controls/data/tst_dialog.qml(89)]
FAIL!  : tst_controls::Basic::Dialog::test_spacing(footer) property active
   Actual   (): false
   Expected (): true
   Loc: [/home/qt/work/qt/qtquickcontrols2/tests/auto/controls/data/tst_dialog.qml(89)]
FAIL!  : tst_controls::Basic::Dialog::test_standardButtons() property active
   Actual   (): false
   Expected (): true
   Loc: [/home/qt/work/qt/qtquickcontrols2/tests/auto/controls/data/tst_dialog.qml(89)]