Add changes file for 5.9.0v5.9.0-rc2v5.9.0-rc1v5.9.0

Listing important changes and bug-fixes. Warning about binary compatibility break.

Change-Id: I7e69b83648d2fa5c6b44ad004d0b8464f7dfe577
Reviewed-by: Johan Helsing <johan.helsing@qt.io>

1 files changed, 56 insertions, 0 deletions

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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:
+
+http://doc.qt.io/qt-5/index.html
+
+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:
+
+https://bugreports.qt.io/
+
+Each of these identifiers can be entered in the bug tracker to obtain more
+information about a particular change.
+
+Important Changes
+-----------------
+
+ * 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.
+
+Client
+------
+
+ - 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.
+
+
+Compositor
+----------
+
+ - 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.