* Fix#1090 - delay locking databases after minimize to allow for clipboard use, Auto-Type use, and browser integration use.
* Fix#6757 - prevent setting both minimize on unlock and lock on minimize settings at the same time.
* Prefer clearing clipboard by explicitly setting the clipboard to an empty string. Qt's QClipboard::clear() method is unreliable under X11 environment.
* Fixes#4126
Performing a dev build against the latest version of Qt failed
because of some deprecated members. They have been replaced
according to the Qt documentation.
Further, Q_OS_MACOS is now the only macro available to identify a
machine running macOS, the others are now deprecated.
See https://doc.qt.io/qt-5/qtglobal.html#Q_OS_OSX and
https://doc.qt.io/qt-5/qtglobal.html#Q_OS_MAC.
