Qt 5.13.1 is a bug-fix release. It maintains both forward and backward
compatibility (source and binary) with Qt 5.13.0.

For more details, refer to the online documentation included in this
distribution. The documentation is also available online:

https://doc.qt.io/qt-5/index.html

The Qt version 5.13 series is binary compatible with the 5.12.x series.
Applications compiled for 5.12 will continue to run with 5.13.

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                        *
****************************************************************************

 - [QTBUG-76521] RCC's default compression algorithm was changed back to
   Zlib, as it was in all previous releases until 5.13.0. The default will
   remain Zlib for all Qt 5.x releases but will change in Qt 6.0. To
   activate Zstd compression for your resources, either pass the
   --compress-algo=zstd option to the rcc tool or add the XML attribute
   compression-algorithm="zstd" to the <file> tags in the .qrc file.

****************************************************************************
*                                 Android                                  *
****************************************************************************

 - [QTBUG-76293] Fix NDK r20 linking.

****************************************************************************
*                                  QtCore                                  *
****************************************************************************

 - Global:
   * [QTBUG-72073] Added the QT_NO_FLOAT16_OPERATORS macro in order to work
     around a Microsoft <= VS2017 compiler bug that is exposed when using
     std::bitset along with any Qt header that includes <qfloat16.h>.

 - QCborStreamReader:
   * Fixed a bug that caused the QIODevice that the data was being read
     from not to show the entire CBOR message as consumed. This allows the
     user to consume data that may follow the CBOR payload.

 - QDeadlineTimer:
   * [QTBUG-69750] Fixed integer overflows leading to immediate timeouts.

 - QStorageInfo:
   * Fixed a bug that caused QStorageInfo to be unable to report all
     filesystems if the options to mounted filesystems were too long (over
     900 characters, roughly), such as those found in Docker overlay
     mounts.

 - QTextBoundaryFinder:
   * Sentence breaking now no longer breaks between uppercase letters and
     comma. This is a deviation from the Unicode specification, but
     produces less surprising behavior.

 - QTimeZone:
   * The IANA timezone database backend now properly follows symlinks even
     when they point to variable locations like /run or /var (useful when
     /etc is mounted read-only).

 - QVector:
   * Fixed a regression that caused fill() not to detach, corrupting shared
     copies.

****************************************************************************
*                                QtNetwork                                 *
****************************************************************************

 - Windows:
   * Correctly emit errors when trying to reach unreachable hosts or
     services

 - QNetworkAccessManager:
   * Fixed QNetworkAccessManager::sendCustomRequest for Qt For WebAssembly.

****************************************************************************
*                                  QtGui                                   *
****************************************************************************

 - [QTBUG-73231] QWindow::mapToGlobal()/mapFromGlobal() now handle windows
   spanning screens correctly.

 - QImage:
   * Improve loading time when loading png files that have the same size as
     the target.

 - QPixmapCache:
   * [QTBUG-76694][QTBUG-72523] Ignore unsafe access from non-main threads

 - Text:
   * [QTBUG-76219] Fixed a bug which could cause the font cache to grow
     larger than it was supposed to.
   * [QTBUG-55096][QTBUG-74761] Fixed bug where regular text rendered with
     a color font would always display in black.

****************************************************************************
*                                QtWidgets                                 *
****************************************************************************

 - QSystemTrayIcon:
   * On macOS, show the icon passed into showMessage in the notification
     popup

 - QDateTimeEdit:
   * Use the information provided by the locale to determine the AM/PM
     strings, unless they are already translated.

 - QGraphicsView:
   * Ignore disabled items when setting the mouse cursor.

 - QMenu:
   * Shortcuts are again shown by default in context menus, except on
     macOS. They can be forced off by setting
     AA_DontShowShortcutsInContextMenus to true.

 - QSplashScreen:
   * On macOS, lower the splash screen when a modal dialog is shown to make
     sure the user sees the dialog.

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

 - Updated bundled SQLite to version 3.28.0
 - Updated QLocale's data to CLDR v35.1

****************************************************************************
*                                  qmake                                   *
****************************************************************************

 - [QTBUG-75653] The CONFIG value c++latest was added to select the latest
   C++ standard the currently used toolchain supports.