Qt 5.9.2 is a bug-fix release. It maintains both forward and backward
compatibility (source and binary) with Qt 5.9.0.

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

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 Behavior Changes                        *
****************************************************************************

 - Building examples inside the Qt source tree while not building Qt itself
   is rejected now, because this can cause hard to debug configuration
   issues. If building isolated examples is needed, you may still use shadow
   builds.

 - This version of Qt restores compatibility with pre-5.9.0 calculation of
   QCryptographicHash algorithms that were labelled "Sha3_nnn": that is,
   applications compiled with old versions of Qt will continue using the
   Keccak algorithm.  Applications recompiled with this version will use
   SHA-3, unless QT_SHA3_KECCAK_COMPAT is #define'd prior to #include
   <QCryptographicHash>.

****************************************************************************
*                               General Notes                              *
****************************************************************************

Binary Compatibility Note
-------------------------

 - The variable QOperatingSystemVersion::AndroidOreo was added in this
   release. Code that uses this variable will not run under Qt 5.9.1. If
   backwards compatibility is desired, use instead
   QOperatingSystemVersion(QOperatingSystemVersion::Android, 8)
   [This is similar to QOperatingSystemVersion::MacOSHighSierra added in
   5.9.1]

 - This version of Qt changes the values assigned to enumerations
   QCryptographicHash::Sha3_nnn. Applications compiled with this version and
   using those enumerations will not work with Qt 5.9.0 and 5.9.1, unless
   QT_SHA3_KECCAK_COMPAT is defined.

Deprecation Notice
------------------

 - Starting with Qt 5.10, IPv6 support will be mandatory for all platforms.
   Systems without proper IPv6 support, such as the getaddrinfo() function
   or the proper socket address structures, will not be able to build
   QtNetwork anymore.

Third-Party Code
----------------

 - [QTBUG-31020] zlib was updated to version 1.2.11.
 - libpng was updated to version 1.6.32

****************************************************************************
*                               Library                                    *
****************************************************************************

QtCore
------

 - [QTBUG-61350] Fixed the conversion from string to double of the strings
   "0E+1" and "0E-1" (with capital E), which QString::toDouble(),
   QByteArray::toDouble() and similar functions reported as invalid.

 - QFile:
   * [QTBUG-57023] Reverted an incorrect change from Qt 5.9.0 that forbade
     the creation and access to Alternate Data Streams on NTFS on Windows.
     This means that file names containing a colon (':') are allowed again,
     but note that they are not regular files.

 - QFileInfo:
   * [QTBUG-62802] Relative symbolic links on Windows are now resolved to
     their absolute path by symLinkTarget().

 - QFileSystemWatcher:
   * [QTBUG-62242] Fixed a crash on Windows if this class was instantiated
     before QCoreApplication was created.
   * [QTBUG-61792] Fixed an issue on Windows that would cause this class not
     to monitor files properly if the directory containing the monitored
     files was added to the list of watched paths after the files.

 - QLocale:
   * [QTBUG-53565] Fixed the conversion of QTime to string form and parsing
     from string form to always treat the value as the decimal fraction of
     the seconds component. That is, the string format ".z" produces/parses
     ".2" for 200 milliseconds and ".002" for 2 milliseconds. Use of "z" or
     "zzz" is discouraged outside decimal fractions to avoid surprises.
   * [QTBUG-61949] Fixed bcp57Name() to return "en" for the QLocale::c()
     locale. Previously, it returned "C", which is not a valid BCP47
     language tag.

 - QProcess:
   * [QTBUG-61634] Added a workaround for a rare race-condition bug in
     some C libraries that caused the child process started by QProcess to
     hang after trying to launch a non-existent executable or change to a
     non-existent directory.
   * [QTBUG-62584] Fixed a race-condition bug that could cause
     waitForXxx() functions to hang forever if a slot triggered by that
     function futher started a nested event loop.

 - QTimeZone:
   * [QTBUG-63205] Fixed a bug that would cause QTimeZone to mis-parse
     timezone files on Unix systems if they contained leap second
     information.

 - QVariant:
   * [QTBUG-61471] Fixed QVariant to actually perform the conversions
     between QVariantHash and QVariantMap in the respective .toHash() and
     .toMap() functions. QVariant already reported true in .canConvert()
     between those two types.

QtDBus
------

  - [QTBUG-62284] Fixed a race condition in QDBusAbstractInterface that
    could cause the class to never see the notification that the remote
    service became available and cause isValid() to change to true.

QtGui
-----

 - Text:
   * [QTBUG-61520] Fixed matching of non-regular font weights for
     application fonts on macOS.

QtNetwork
---------

 - [QTBUG-61692] Fixed the handling of application-wide proxy settings (set
   with QNetworkProxy): previously, QTcpSocket would directly fall back to
   the system settings if the object-specific setting was
   QNetworkProxy::DefaultProxy.

 - QLocalSocket:
   * [QTBUG-61643] Fixed an issue with Qt pipe-handling code that could
     cause deadlocks on Windows, most often if the QLocalSocket object tried
     to wait for more data during application shutdown.

QtTest
------

 - Added flowId to messages when logging in TeamCity format. FlowId is used
   to distinguish logging from multiple processes running in parallel.

QtWidgets
---------

 - Android:
   * [QTBUG-48639] Fixed label duplication for buttons when using style
     sheets with the Android style.

 - QLineEdit:
   * [QTBUG-60319] Fixed behavior of the ImSurroundingText query.
     Previously, it returned a masked text whose length may be less than
     the cursor position. Now it returns unmasked text, so the text length
     is always greater than or equal to the cursor position.

 - QMenu:
   * [QTBUG-59794] Fixed menu size issue when using high DPI on
     multi-screen system.

****************************************************************************
*                       Compiler-specific Changes                          *
****************************************************************************

clang
-----

 - [QTBUG-61840][QTBUG-62085] Fixed an issue that caused recent Clang
   versions to print a warning about [[nodiscard].

Visual Studio
-------------

 - [QTBUG-61902] Changed Qt uses of certain C++ Standard Library functions
   that Visual Studio warns about. Now Qt public headers call
   Microsoft-specific versions that do not produce warnings.

****************************************************************************
*                         Platform-specific Changes                        *
****************************************************************************

macOS
-----

 - [QTBUG-59222] Switching focus objects inside a top level window while
   composing text using dead keys or input method events would leave the
   application in an inconsistent state. The composition now automatically
   cancels when the focus object changes.

Windows
-------

 - [QTBUG-57916] Fixed build with ANGLE and newer MinGW versions.
 - [QTBUG-62083] Fixed Qt trying to steal certain events from user windows if
   the event ID was WM_USER.

****************************************************************************
*                                Tools                                     *
****************************************************************************

configure & build system
------------------------

 - [QTBUG-35928][QTBUG-41908][Apple] Qt can now be built using just the
   Xcode Command Line Tools, without needing to install the full Xcode IDE.
 - [QTBUG-55755][Windows] All Qt .exe files now include meta information,
   like .dll files already did.
 - [QTBUG-58012] (Re-)added a way to specify alternative ICU libraries.
 - [QTBUG-62150] Fixed detection of ICU in static builds.
 - [QTBUG-53537][X11] Added missing detection of Xinerama.
 - [QTBUG-61731][X11] Fixed detection of AT-SPI, allowing accessibility
   support to be built again.
 - [X11] Fixed detection of x11-xcb with pkg-config.
 - [CMake] All Qt module defines are now propagated to the config files.

qmake
-----

 - [QTBUG-31034] Added qmake feature and configure option to use ccache.
 - [QTBUG-48342] Fixed generation of extraneous slashes in -project mode.
 - [QTBUG-55633] Fixed misparsing of some string literal concatenations
   as C++11 raw strings. This affects dependency scanning.
 - [QTBUG-59301][Xcode] Fixed duplicate references in project files.
 - [QTBUG-59827][nmake] The 'clean' target now deletes backup files of
   MSVC manifests.
 - [QTBUG-60455][Android] libc++ is now used instead of libstdc++ when
   building with the android-clang mkspec.
 - [QTBUG-60430][iOS] Fixed handling of the deprecated variable
   QMAKE_IOS_TARGETED_DEVICE_FAMILY.
 - [QTBUG-60899][WinRT] Fixed capability handling for Win10 targets.
 - [WinRT] Added support for new Win10 capabilities.
 - [QTBUG-61335][MinGW] Worked around LTO+MRI linker issue when cross-
   building from Linux.
 - [QTBUG-61411][Windows] _UNICODE is now defined, consistently with VS.
 - [QTBUG-61688][MSVC] Fixed compilation of precompiled headers with
   CONFIG+=silent. Done by removing redundant progress messages.
 - [QTBUG-61690][QTBUG-61735] Fixed detection of compiler default search
   paths for various compilers and platforms.
 - [QTBUG-63197][Windows] Fixed moc'ing in a build directory with spaces
   when INCLUDEPATH contains 40+ entries.
 - [Android] Fixed building with ndkr16+ by using unified headers.
 - [Windows] Fixed repeated installation of read-only files.
 - [VS] Fixed deployment rules in created solution files.