Mac: Wrong positioning of sheet when setUnifiedTitleAndToolBarOnMac is used

{noformat} Qt 5.9.3 (x86_64-little_endian-lp64 shared (dynamic) release build; by Clang 8.1.0 (clang-802.0.42) (Apple)) on "cocoa" OS: macOS High Sierra (10.13) [darwin version 17.2.0] Architecture: x86_64; features: SSE2 SSE3 SSSE3 SSE4.1 SSE4.2 AVX AVX2 Environment: Features: QT_NO_EXCEPTIONS QT_NO_OPENSSL Library info:   PrefixPath: /Users/dabu/Qt5.9.3/5.9.3/clang_64   DocumentationPath: /Users/dabu/Qt5.9.3/Docs/Qt-5.9.3   HeadersPath: /Users/dabu/Qt5.9.3/5.9.3/clang_64/include   LibrariesPath: /Users/dabu/Qt5.9.3/5.9.3/clang_64/lib   LibraryExecutablesPath: /Users/dabu/Qt5.9.3/5.9.3/clang_64/libexec   BinariesPath: /Users/dabu/Qt5.9.3/5.9.3/clang_64/bin   PluginsPath: /Users/dabu/Qt5.9.3/5.9.3/clang_64/plugins   ImportsPath: /Users/dabu/Qt5.9.3/5.9.3/clang_64/imports   Qml2ImportsPath: /Users/dabu/Qt5.9.3/5.9.3/clang_64/qml   ArchDataPath: /Users/dabu/Qt5.9.3/5.9.3/clang_64   DataPath: /Users/dabu/Qt5.9.3/5.9.3/clang_64   TranslationsPath: /Users/dabu/Qt5.9.3/5.9.3/clang_64/translations   ExamplesPath: /Users/dabu/Qt5.9.3/Examples/Qt-5.9.3   TestsPath: /Users/dabu/Qt5.9.3/5.9.3/clang_64/tests   SettingsPath: /Users/dabu/Qt5.9.3/5.9.3/clang_64 Standard paths [*...* denote writable entry]:   DesktopLocation: "Desktop" */Users/dabu/Desktop*   DocumentsLocation: "Documents" */Users/dabu/Documents*   FontsLocation: "Fonts" */Users/dabu/Library/Fonts* /Library/Fonts /System/Library/Fonts   ApplicationsLocation: "Applications" */Users/dabu/Applications* /Applications   MusicLocation: "Music" */Users/dabu/Music*   MoviesLocation: "Movies" */Users/dabu/Movies*   PicturesLocation: "Pictures" */Users/dabu/Pictures*   TempLocation: "Temporary Items" */var/folders/lp/5pdjf7gn54sgnh8g915vs43rfrpsp5/T*   HomeLocation: "Home" */Users/dabu*   AppLocalDataLocation: "Application Support" */Users/dabu/Library/Application Support/QtProject/qtdiag* /Library/Application Support/QtProject/qtdiag /Users/dabu/Qt5.9.3/5.9.3/clang_64/bin   CacheLocation: "Caches" */Users/dabu/Library/Caches/QtProject/qtdiag* /Library/Caches/QtProject/qtdiag   GenericDataLocation: "Application Support" */Users/dabu/Library/Application Support* /Library/Application Support   RuntimeLocation: "Application Support" */Users/dabu/Library/Application Support*   ConfigLocation: "Preferences" */Users/dabu/Library/Preferences*   DownloadLocation: "Downloads" */Users/dabu/Downloads*   GenericCacheLocation: "Caches" */Users/dabu/Library/Caches* /Library/Caches /System/Library/Caches   GenericConfigLocation: "Preferences" */Users/dabu/Library/Preferences*   AppDataLocation: "Application Support" */Users/dabu/Library/Application Support/QtProject/qtdiag* /Library/Application Support/QtProject/qtdiag /Users/dabu/Qt5.9.3/5.9.3/clang_64/bin   AppConfigLocation: "Preferences" */Users/dabu/Library/Preferences/QtProject/qtdiag* File selectors (increasing order of precedence):   en_BE unix darwin mac osx macos Network:   Using "Secure Transport, macOS High Sierra (10.13)", version: 0x0 Platform capabilities: ThreadedPixmaps OpenGL ThreadedOpenGL BufferQueueingOpenGL WindowMasks MultipleWindows ApplicationState ForeignWindows NonFullScreenWindows NativeWidgets WindowManagement RasterGLSurface ApplicationIcon Style hints:   mouseDoubleClickInterval: 400   mousePressAndHoldInterval: 800   startDragDistance: 10   startDragTime: 500   startDragVelocity: 0   keyboardInputInterval: 400   keyboardAutoRepeatRate: 30   cursorFlashTime: 1000   showIsFullScreen: 0   showIsMaximized: 0   passwordMaskDelay: 0   passwordMaskCharacter: U+2022   fontSmoothingGamma: 2   useRtlExtensions: 0   setFocusOnTouchRelease: 0   tabFocusBehavior: Qt::TabFocusBehavior(TabFocusAllControls)   singleClickActivation: 0 Additional style hints (QPlatformIntegration):   ReplayMousePressOutsidePopup: 1 Theme:   Platforms requested : cocoa             available :   Styles requested    : macintosh          available    : Windows,Fusion,Macintosh   System font         : ".SF NS Text" 13   Native file dialog   Native color dialog   Native font dialog Fonts:   General font : ".SF NS Text" 13   Fixed font   : "Monaco" 10   Title font   : ".SF NS Text" 13   Smallest font: ".SF NS Text" 9 Palette:   WindowText: #ff000000   Button: #ffececec   Light: #ffffffff   Midlight: #fff5f5f5   Dark: #ffbfbfbf   Mid: #ffa9a9a9   Text: #ff000000   BrightText: #ffffffff   ButtonText: #ff000000   Base: #ffffffff   Window: #ffececec   Shadow: #ff8b8b8b   Highlight: #ffb2d7ff   HighlightedText: #ff000000   Link: #ff0000ff   LinkVisited: #ffff00ff   AlternateBase: #fff5f5f5   NoRole: #ff000000   ToolTipBase: #ffffffc7   ToolTipText: #ff000000 Screens: 2, High DPI scaling: inactive # 0 "Color LCD" Depth: 24 Primary: yes   Manufacturer:   Model:   Serial number:   Geometry: 1440x900+0+0 Available: 1440x877+0+23   Virtual geometry: 3360x1200+0+0 Available: 3360x1097+0+23   2 virtual siblings   Physical size: 331.005x206.878 mm  Refresh: 60 Hz Power state: 0   Physical DPI: 110.5,110.5 Logical DPI: 72,72 Subpixel_RGB   DevicePixelRatio: 2 Pixel density: 1   Primary orientation: 2 Orientation: 2 Native orientation: 0 OrientationUpdateMask: 0 # 1 "DELL U2412M" Depth: 24 Primary: no   Manufacturer:   Model:   Serial number:   Geometry: 1920x1200+1440+0 Available: 1920x1097+1440+23   Virtual geometry: 3360x1200+0+0 Available: 3360x1097+0+23   2 virtual siblings   Physical size: 518.809x324.255 mm  Refresh: 60 Hz Power state: 0   Physical DPI: 94,94 Logical DPI: 72,72 Subpixel_RGB   DevicePixelRatio: 1 Pixel density: 1   Primary orientation: 2 Orientation: 2 Native orientation: 0 OrientationUpdateMask: 0 LibGL Vendor: ATI Technologies Inc. Renderer: AMD Radeon R9 M370X OpenGL Engine Version: 2.1 ATI-1.58.32 Shading language: 1.20 Format: Version: 2.1 Profile: 0 Swap behavior: 2 Buffer size (RGB): 8,8,8 Depth buffer: -1 Stencil buffer: -1 {noformat}