Mutter 3.19.4 adds support for wl_pointer v5 events and implements Drag-and-Drop (DND) actions for the next-gen Wayland display server. Moreover, Mutter now supports screen rotation, but only if it’s supported by driver, adds better support for updating the stacking order when the ‘transient_for’ argument is set, handles broken WM_CLASS property implementations, and fixes multiple bugs.
On the other hand, GNOME Shell 3.19.4 does not allow bypassing of the disabled Sign In button in the GDM (GNOME Display Manager) login screen, implements style week numbers for the Calendar applet, and addresses various minor issues.