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+Qt 5.9 introduces many new features and improvements as well as bugfixes
+over the 5.8.x series. For more details, refer to the online documentation
+included in this distribution. The documentation is also available online:
+With the exception noted below, the Qt version 5.9 series is binary compatible
+with the 5.8.x series. Applications compiled for 5.8 will continue to run with 5.9.
+Some of the changes listed in this file include issue tracking numbers
+corresponding to tasks in the Qt Bug Tracker:
+Each of these identifiers can be entered in the bug tracker to obtain more
+information about a particular change.
+ * Binary compatibility breakage in QtWaylandCompositor.
+ The class QWaylandQuickOutput now also inherits from QQmlParserStatus. This class
+ is primarily useful from QML, and there is little reason for it to used in
+ user C++ code. Any compositor using or instantiating the QtWaylandCompositor class
+ from C++ will have to be recompiled against Qt 5.9. Failure to do so may lead to crashes,
+ buffer overruns, or undefined behavior.
+ - Added xdg_shell_v6 support for Qt clients.
+ - Clients now default to using xdg_shell_v6 if available, else wl_shell.
+ - Deprecated the QT_WAYLAND_USE_XDG_SHELL environment variable in favor of
+ QT_WAYLAND_SHELL_INTEGRATION, which can be set to one of [ivi-shell, wl-shell,
+ xdg-shell-v5, xdg-shell-v6].
+ - Fixed crash when the receiver of a paste closes the pipe.
+ - QWaylandQuickOutput: Automatically set the compositor if output is a child of
+ the compositor.
+ - QWaylandXdgSurfaceV5 now sets the windowType property and behaves like
+ other shell surface implementations.
+ - QWaylandXdgPopupV5 position property now has change notification.
+ - [QTBUG-55303] Added support for running compositors with custom device pixel ratio.
+ - [QTBUG-58299] Fixed wayland-egl compositing using NVIDIA graphics.