Large parts of the application have been restructured. For instance QtSingleApplication is now being used. The major new feature is the window manager decoration close button (X at the top right) can now optionally iconify the window when clicked. The -c command line option has also changed. It no longer creates a borderless window it now disables the iconify behavior of the decoration close button.
Note: There is one known issue with this release. Drag and Drop is partly broken for docked windows.