Doc: Document new features in Qt 5.15

Based on https://wiki.qt.io/New_Features_in_Qt_5.15

Fixes: QTBUG-83621
Change-Id: I544f116fb8e6818b58d6c9f66e91a69c10b253fb
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@qt.io>

3 files changed, 293 insertions, 3 deletions

diff --git a/doc/src/classes.qdoc b/doc/src/classes.qdoc
index e364844c..a26f4792 100644
--- a/doc/src/classes.qdoc
+++ b/doc/src/classes.qdoc
@@ -58,7 +58,7 @@
     \li \l{All Namespaces}
     \li \l{All Classes by Module}
     \li \l{Obsolete Classes}
-    \li \l{New Classes and Functions in Qt 5.14}
+    \li \l{New Classes and Functions in Qt 5.15}
     \endlist
 
     For more reference pages including QML types, visit \l{Qt Reference Pages}.
@@ -82,7 +82,7 @@
     \li \l{All QML Types}
     \li \l{All QML APIs by Module}
     \li \l{Obsolete QML Types}
-    \li \l{New Classes and Functions in Qt 5.14}
+    \li \l{New Classes and Functions in Qt 5.15}
     \endlist
 
     For more reference pages including C++ APIs, visit \l{Qt Reference Pages}.
@@ -105,7 +105,7 @@
     \li \l{All QML Basic Types}
     \li \l{All QML APIs by Module}
     \li \l{Obsolete QML Types}
-    \li \l{New Classes and Functions in Qt 5.14}
+    \li \l{New Classes and Functions in Qt 5.15}
     \endlist
 
     For more reference pages including C++ APIs, visit \l{Qt Reference Pages}.
diff --git a/doc/src/qt5-intro.qdoc b/doc/src/qt5-intro.qdoc
index 7d7ad6c5..dfbdf362 100644
--- a/doc/src/qt5-intro.qdoc
+++ b/doc/src/qt5-intro.qdoc
@@ -57,6 +57,7 @@
     \section1 New Features by Qt Version
 
     \list
+        \li \l{What's New in Qt 5.15}
         \li \l{What's New in Qt 5.14}
         \li \l{What's New in Qt 5.13}
         \li \l{What's New in Qt 5.12}
diff --git a/doc/src/whatsnew/whatsnew515.qdoc b/doc/src/whatsnew/whatsnew515.qdoc
new file mode 100644
index 00000000..51190d08
--- /dev/null
+++ b/doc/src/whatsnew/whatsnew515.qdoc
@@ -0,0 +1,289 @@
+/****************************************************************************
+**
+** Copyright (C) 2020 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the documentation of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:FDL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Free Documentation License Usage
+** Alternatively, this file may be used under the terms of the GNU Free
+** Documentation License version 1.3 as published by the Free Software
+** Foundation and appearing in the file included in the packaging of
+** this file. Please review the following information to ensure
+** the GNU Free Documentation License version 1.3 requirements
+** will be met: https://www.gnu.org/licenses/fdl-1.3.html.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+/*!
+    \page whatsnew515.html
+    \title What's New in Qt 5.15
+    \brief Lists the new features in Qt 5.15.
+
+    \section1 New Features in Qt 5.15
+
+    \section2 Qt 3D Module
+
+    \list
+        \li Improved profiling and troubleshooting support.
+        \li QSortPolicy: introduced a uniform mode to control whether uniform
+            minification needs to be performed or not.
+        \li QMouseDevice: introduced a \l {Qt3DInput::QMouseDevice::}
+            {updateAxesContinuously} property.
+        \li Isolated the OpenGL renderer as a plugin.
+    \endlist
+
+    \section2 Qt Core Module
+
+    \list
+        \li Introduced QFile::moveToTrash() to provide a cross-platform API for
+            moving files to the trash/recycling bin on Windows, \macos, and Linux
+            desktops. This implements the \l {https://specifications.freedesktop.org/trash-spec/trashspec-1.0.html}
+            {freedesktop.org specification}.
+        \li Introduced QFileInfo::isJunction() to detect whether a file system
+            entry is a Windows NTFS junction.
+        \li QRunnable instances can now be created from \c std::function without
+            having to subclass QRunnable.
+        \li QThreadPool::start() and \l {QThreadPool::}{tryStart}() can now take
+            \c std::function and thereby also anonymous lambda functions as
+            arguments.
+        \li Added static template QDebug::toString() function, which streams the
+            given object into a QDebug instance that operates on a string, and
+            then returns that string. This is useful for cases where you need the
+            textual representation of an object for debugging, but cannot use
+            \c {operator<<}, such as when passing a failure message to QVERIFY2().
+        \endlist
+
+    \section2 Qt GUI Module
+
+    \list
+        \li QColorSpace setters can now operate on invalid color spaces, making it
+            possible to set \l {QColorSpace::}{primaries} and
+            \l {QColorSpace::transferFunction()}{transfer function} independently.
+        \li Implemented multi-threading support for many QImage scaling and
+            conversion methods.
+    \endlist
+
+    \section2 Qt Multimedia Module
+
+    \list
+        \li Deprecated all plugin APIs.
+        \li Deprecated QMediaService and QMediaControl.
+        \li Introduced reverse playback for GStreamer.
+        \li Introduced rendering to multiple surfaces.
+        \li Introduced QVideoWidget::videoSurface(),
+            QGraphicsVideoItem::videoSurface(), and
+            QDeclarativeVideoOutput::videoSurface().
+        \li \l [QML] MediaPlayer QML type: Introduced a \l [QML] {MediaPlayer::}
+            {videoOutput} property.
+        \li Introduced QVideoFrame::image().
+        \li GStreamer camerabin: React to changes in \c notify::zoom and
+            \c notify::max-zoom properties.
+    \endlist
+
+    \section2 Qt Network Module
+
+    \list
+        \li OpenSSL backend: Added support for a new session ticket mechanism
+            introduced by the TLS 1.3 protocol.
+        \li Implemented timeouts for downloads and uploads with QNetworkRequest
+            and QNetworkAccessManager.
+        \li Increased the minimum supported version of OpenSSL to 1.1.
+    \endlist
+
+    \section2 Qt QML Module
+
+    \list
+        \li Introduced inline components; multiple QML components can be declared
+            in the same file.
+        \li Introduced required properties.
+        \li Added a declarative way of registering types to QML.
+        \li \e qmllint now has a better understanding of the code and warns about
+            deprecated QML features.
+        \li Added the \e qmlformat tool to automatically format any QML file
+            according to the \l {QML Coding Conventions}.
+        \li Added support for the \l {https://github.com/tc39/proposal-nullish-coalescing}
+            {Nullish Coalescing Operator}.
+        \li Added a \c colorspace property on image nodes, making it possible to
+            read color spaces and transform images into a specific color space.
+    \endlist
+
+    \section2 Qt Quick Module
+
+    \list
+        \li Added a \l [QML] PathText type which can be used together with Qt
+            Quick Shapes to render text as geometry, without relying on distance
+            fields or pre-rendered textures. This is useful for rendering large
+            font sizes which would otherwise consume a lot of texture memory.
+        \li Added a \l [QML] {Image::sourceClipRect}{Image.sourceClipRect}
+            property to request the image plugin to render a portion of an image
+            source.
+        \li Added a \c cursorShape property to pointer handlers. Most pointer
+            handlers (for example DragHandler) will change the cursor when in
+            active state. HoverHandler will change the cursor when the mouse is
+            hovering over the Item that contains the handler.
+        \li Added support for Metal on iOS for the opt-in preview of the
+            \e {Graphics API Independent Rendering Architecture}.
+    \endlist
+
+    \section2 Qt Quick Controls Module
+
+    \list
+        \li Added HorizontalHeaderView and VerticalHeaderView to display header data
+            in a TableView, with support for flicking synchronization and multiple
+            styles: \e default, \e fusion, \e imagine, \e material, and \e universal.
+        \li Added a \l [QML] {ComboBox::}{selectTextByMouse} property to ComboBox.
+    \endlist
+
+    \section2 Qt WebEngine Module
+
+    \list
+        \li Updated to Chromium 80.
+        \li Switched to use a sandboxed network service.
+        \li Introduced a new API for reading the subprocess ID of a page or a view.
+        \li Introduced a \l [QML] {WebEngineHistory::clear()}{WebEngineHistory.clear}()
+            method.
+    \endlist
+
+    \section2 Tools
+
+    \list
+        \li QDoc can now generate DocBook.
+        \li QDoc now generates output for C++ class and function template parameters.
+        \li QDoc now generates correct output for scoped enums (enum classes).
+    \endlist
+
+    \section1 Platform Changes
+
+    \b Android
+    \list
+        \li Introduced the use of Android's native file dialog by default for open
+            (file, multiple files, directory) and save operations.
+    \endlist
+
+    \b Wayland
+    \list
+        \li Introduced experimental support for Vulkan on the client side.
+    \endlist
+
+    \b {Embedded Linux (eglfs)}
+    \list
+        \li \c eglfs_viv backend: Added support for Vulkan, via VK_KHR_display, on
+            NXP i.MX8 based devices.
+    \endlist
+
+    \section1 New Modules
+
+    \b {Qt Quick 3D}
+    \list
+        \li Introduced post-processing effects.
+        \li Introduced a custom geometry API (C++ meshes).
+        \li Introduced Quaternions API for Node rotations.
+        \li Switched to use a right-handed coordinate system (previously right or
+            left).
+        \li Improved support for Qt Quick 2D in 3D scenes.
+        \li Added support for spot lights.
+        \li Performance improvements.
+    \endlist
+
+    \b {Qt Lottie}
+    \list
+        \li Introduced a \e Bodymovin JSON renderer for Adobe After Effects
+            animations.
+        \li Performance and stability improvements.
+    \endlist
+
+    \b {Qt PDF}
+    \list
+        \li Based on a version of \e Pdfium that is shared with Qt WebEngine.
+        \li Available on the same platforms as Qt WebEngine, and also on iOS.
+    \endlist
+
+    \section1 Deprecated Modules
+
+    To help preparing for the transition to Qt 6, numerous classes and member
+    functions that will be removed from Qt 6.0 have been marked as deprecated
+    in the Qt 5.15 release. Unless you define QT_NO_DEPRECATED_WARNINGS in your
+    project, you will get compiler warnings for code that uses any deprecated
+    APIs. Those warnings will explain which API to use instead. To disable any
+    deprecated APIs completely, use the QT_DISABLE_DEPRECATED_BEFORE macro.
+
+    The following modules are part of Qt 5.15 release, but are deprecated and
+    considered for removal in subsequent releases of Qt:
+
+    \list
+        \li Qt Script
+        \li Qt Quick Controls 1
+        \li Qt XML Patterns
+    \endlist
+
+    \section1 List of API Changes
+
+    The pages below contain a list of API changes in Qt 5.15:
+    \list
+        \li \l{New Classes and Functions in Qt 5.15}
+        \li \l{Obsolete Classes}
+    \endlist
+
+    \section1 Additions to Other Qt 5 Releases
+
+    \list
+        \li \l{What's New in Qt 5.14}
+        \li \l{What's New in Qt 5.13}
+        \li \l{What's New in Qt 5.12}
+        \li \l{What's New in Qt 5.11}
+        \li \l{What's New in Qt 5.10}
+        \li \l{What's New in Qt 5.9}
+        \li \l{What's New in Qt 5.8}
+        \li \l{What's New in Qt 5.7}
+        \li \l{What's New in Qt 5.6}
+        \li \l{What's New in Qt 5.5}
+        \li \l{What's New in Qt 5.4}
+        \li \l{What's New in Qt 5.3}
+        \li \l{What's New in Qt 5.2}
+        \li \l{What's New in Qt 5.1}
+        \li \l{What's New in Qt 5.0}
+    \endlist
+*/
+
+/*!
+    \page newclasses515.html
+    \title New Classes and Functions in Qt 5.15
+    \brief A list of new APIs in Qt 5.15.
+
+    This page contains a comprehensive list of all new classes and functions
+    introduced in Qt 5.15. Links to new APIs in previous Qt 5 releases are found
+    at the bottom of this page.
+
+    \sincelist 5.15
+
+    \section1 Additions to Other Qt 5 Releases
+
+    \list
+        \li \l{What's New in Qt 5.14}
+        \li \l{What's New in Qt 5.13}
+        \li \l{What's New in Qt 5.12}
+        \li \l{What's New in Qt 5.11}
+        \li \l{What's New in Qt 5.10}
+        \li \l{What's New in Qt 5.9}
+        \li \l{What's New in Qt 5.8}
+        \li \l{What's New in Qt 5.7}
+        \li \l{What's New in Qt 5.6}
+        \li \l{What's New in Qt 5.5}
+        \li \l{What's New in Qt 5.4}
+        \li \l{What's New in Qt 5.3}
+        \li \l{What's New in Qt 5.2}
+        \li \l{What's New in Qt 5.1}
+        \li \l{What's New in Qt 5.0}
+    \endlist
+*/