MainWindow::setUnifiedTitleAndToolBarOnMac is broken on High Sierra. It still changes the style of the tool bar slightly, but now there's a separator line between the title bar and the tool bar. Screen shot and minimal sample are attached.
|For Gerrit Dashboard: QTBUG-63444|
|208117,2||QCocoaWindow: Toggle titlebar transparency to support unified toolbar||5.9||qt/qtbase||Status: MERGED||+2||0|