Release note

Qt 6.2.4 release is a patch release made on the top of Qt 6.2.3.
As a patch release, Qt 6.2.4 does not add any new functionality but provides
bug fixes and other improvements and maintains both forward and backward
compatibility (source and binary) with Qt 6.2.3.

For detailed information about Qt 6.2, refer to the online documentation
included in this distribution. The documentation is also available online:

https://doc.qt.io/qt-6/index.html

The Qt version 6.2 series is binary compatible with the 6.1.x series.
Applications compiled for 6.1 will continue to run with 6.2.

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.

To make it easier to port to Qt 6, we have created a porting guide to
summarize those changes and provide guidance to handle them. In the
guide, you can find links to articles about changes that may affect your
application and help you transition from Qt 5.15 to Qt 6:

https://doc.qt.io/qt-6/portingguide.html

Important Changes

qtbase

• fa8b14f830 QTzTimeZonePrivate: fix UB (data race on m_icu)
  Fixed a data race on Unix platforms when implicitly-shared copies of
  QTimeZone objects were used in certain ways (e.g. calling displayName())
  from different threads and Qt was configured with ICU support.

• 6eed0d3f4e JSON: When clearing duplicate object entries, also clear
  containers
  A memory leak in the JSON parser when reading objects with duplicate
  keys was fixed.

• 9540c0b27f Fix crash when text shaping fails
  Fixed a possible crash with certain fonts when shaping strings
  consisting only of control characters.

• 3c193fa077 QScreen_win: retrieve user friendly monitor name
  QScreen::name() now returns the user friendly name instead of the GDI
  device name on Windows. This is consistent with other platforms and also
  obeys the documentation.

• 8f79520cd6 Enable all supported 1.0 device features in QVulkanWindow
  QVulkanWindow is now enabling all Vulkan 1.0 features reported as
  supported from the physical device.

• 2e2d544588 Fix clipped glyphs in text rendering of QGraphicsTextItem
  Clipping of visible glyphs when doing partial updates of a graphics
  view was off by 1. Also fixed an issue that caused rounding errors when
  transforming the clip rect into the glyphs draw space which was caused
  by transforming a QRect instead of a QRectF.

• 44335e65bf Sequential erase/_if: don't apply predicate twice to
  element
  A fix in the implementation of the erase-like algorithms of sequential
  Qt container may re-enable signed/unsigned comparison warnings
  previously suppressed by having occurred in std library code. To fix,
  cast the value to look for such that it has the same signedness as the
  container's elements.

• 899ab8f0df Fix C++20 ambiguous relational operators between
  QJsonValue{,Ref}
  Fixed relational operators to not cause warnings/ambiguities when
  compiling in C++20.

• ab6915f0ef QProcess/Unix: ensure we don't accidentally execute
  something from CWD
  When passed a simple program name with no slashes, QProcess on Unix
  systems will now only search the current directory if "." is one of the
  entries in the PATH environment variable. This bug fix restores the
  behavior QProcess had before Qt 5.9. If launching an executable in the
  directory set by setWorkingDirectory() or inherited from the parent is
  intended, pass a program name starting with "./". For more information
  and best practices about finding an executable, see QProcess'
  documentation.

• 4114c1163b QDesktopServices: fix ABA problem in
  QOpenUrlHandlerRegistry
  Fixed a bug where destroying and re-creating a handler object in quick
  succession could cause the registration for the handler to be lost.

• 360f181857 configure: Allow specifying arbitrary variable assignments
  Users can directly assign CMake variables with configure, for example
  "configure CMAKE_CXX_COMPILE=clang++-11".

• b3d1ea8530 QDesktopServices: deprecate destroying URL handlers w/o
  explicit unsetUrlHandler()
  URL handlers that have been passed to setUrlHandler() must now be
  removed by calling unsetUrlHandler() before they are destroyed. Relying
  on the handler's destructor to implicitly unset it is now deprecated,
  because it may already be in use by concurrent openUrl() calls. Support
  for implicit unsetting will be removed in 6.6 and, until then, a
  qWarning() is raised if it is exercised.

• b3d19fbf95 QMetaObjectBuilder: fix addProperty() recording of the
  property type
  Fixed a bug that would cause addProperty() to use the incorrect type
  for the property if the property's name matched a valid type registered
  with QMetaType.

qttools

• 5b641c12a Qt Designer: Enable the QWebEngineView, QQuickWidget plugins
  on Windows
  Qt Designer now sets the Graphics API to OpenGL in order to enable the
  QWebEngineView and QQuickWidget plugins.

Fixes

qtbase

• QTBUG-99630 tst_QShortcut::text is flaky in dev
• QTBUG-99620 QMetaType: type QMap> has
  more than one typedef alias: ColumnAlignmentMap, ColumnAlignmentMap
• QTBUG-96916 Qt 6 breaks compatibility of QVariant streaming into
  QDataStream
• QTBUG-99743 QTabWidget rendering broken on macOS 12
• QTBUG-99676 markdown (and html) import/export should not rely on use
  of a fixed-pitched font to remember a monospace span
• QTBUG-92445 Markdown smashes nested formatting inside lists
• QTBUG-99148 Broken html list rendering because element
• PYSIDE-1773 uic doesn't import QAbstractItemView for
  QTableView/QTreeView EditTriggers

• PYSIDE-1404 Incompatible import of "Object" in compiled UI

• QTBUG-99771 Porting guide does not mention binary JSON

• QTBUG-72103 Conversion between QQuaternion and Euler angles has issues
  in special cases
• QTBUG-99642 Can't define CSS with properties for QToolButton with Qt 6
• QTBUG-99666 Qt module builds mix install and staging prefixes
• QTBUG-99799 Memory leak in QJsonDocument::fromJson()
• QTBUG-92358 One More Crash in text shaping on special string with
  EmojiOneColor font.
• QTBUG-89155 Assertion violation in text shaping on special string with
  EmojiOneColor font.
• QTBUG-80666 QNetworkRequest::setHeader(IfModifiedSince) treats local
  time as UTC
• QTBUG-97535 Bug in examples for QListIterator Class
• QTBUG-99486 Extra dot appears in top left corner of Fusion style spin
  box frames with no buttons
• QTBUG-99323 [REG: 5.14.2 -> 5.15.0] Posted events get stuck when
  QCoreApplication::processEvents with QEventLoop::WaitForMoreEvents is
  used
• QTBUG-100067 network/torrent examples ProgressBar text should be
  layout with horizontal
• QTBUG-96718 Crash in inBindingWrapper() (Creator built against Qt 6.2
  build)
• QTBUG-99534 tst_qfuture memleaks
• QTBUG-95309 Compile fails with Qt in namespace and C++20
• QTBUG-100072 Building Qt from source fails to compile with C++20
  standard enabled when using MSVC 2022
• QTBUG-100144 Dependency update on qt/qtwebchannel failed in dev
• QTBUG-99747 QDate::startOfDay( ) leads to assert in debug build
• QTBUG-99522 qmake adds @ mark after then the output file name when it
  calls g++ on either Qt's MinGW or MSYS2 platform
• QTBUG-100074 Building QSharedMemory fails when bootstrapping
• QTBUG-87136 Animations run twice as fast on a 120hz Android device
• QTBUG-93823 Android QPlatformScreen does not expose the refresh rate:
  Animations (and timers) too fast on higher refresh rate monitors
• QTBUG-94959 Timer and animations runs faster after screen touch event
  on Android 11
• QTBUG-93393 Android A11Y TalkBack: Hidden onPressAction still called
• QTBUG-100233 Android broken project/wrong libraries linked when adding
  UiTools
• QTBUG-62185 QVersionNumber seems broken on -O1 and higher with g++
• QTBUG-95842 testlib's autotest compilation fails with glibc 2.34
• QTBUG-100315 FEATURE_headersclean does not work with if
  CMAKE_CXX_FLAGS contains more than one option
• QTBUG-100365 Can't build qt libraries on Windows
• QTBUG-94608 Nonsensical full path to examples
• QTBUG-100317 QMacStyle code references missing image resource
• QTBUG-44096 QNetworkAuthenticationManager does not emit
  authenticationRequired when using NTLM
• QTBUG-100071 QtFuture::connect fails to compile if the passed signal
  takes a std::tuple as argument
• QTBUG-93432 QGraphicsTextItem font gets incorrectly clipped when a
  clip rect is set on the painter.
• QTBUG-100037 QSqlQuery: crash on executing query if connection is
  already closed
• QTBUG-100416 QPluginLoader::loadHints return "no hints set" but by
  default PreventUnloadHint is set
• QTBUG-97157 attempting to interact with any widget dialog on
  touchscreen fails; mouse causes crash after that
• QTBUG-100327 CompositionMode_Screen wrong with drawImage
• QTBUG-93402 Android A11Y TalkBack: Focus Rect not updated on
  orientation Change
• QTBUG-100290 Custom build fails with PCH
• QTBUG-100362
  tst_QNetworkReply::putWithServerClosingConnectionImmediately is flaky
• QTBUG-63196 QNetworkReply::putWithServerClosingConnectionImmediately
  fails on Windows
• QTBUG-98476
  tst_QNetworkReply::putWithServerClosingConnectionImmediately fails in
  QtBase with Windows 11
• QTBUG-100420 QPicture doesn't respect Qt::IntersectClip when used with
  setClipPath
• QTBUG-100493 QtFinishPrlFile.cmake: No such file or directory with
  multi-config build on Linux
• QTBUG-96212 The visibility of placeHolderText of the QPlainTextEdit is
  not reevaluated in the setter
• QTBUG-78797 Shift-select drag distance is zero in QTreeView
• QTBUG-81542 QListView range selection changes after 1 pixel move
• QTBUG-99512 QListview selectcount error with items of differing
  sizes
• QTBUG-100438 Incorrect rounding to ms in QTimer when clock too coarse

• QTBUG-51327 [Windows 8.1]: After maximizing a window and toggling the
  frameless window hint and moving to another monitor then the window can
  be too big

• QTBUG-100545 Nested QML items with Accessible properties set does not
  work on Android

• QTBUG-100217 [REG 6.2.2 -> 6.2.3] Integer overflow when rendering svg
  image
• QTBUG-88136 tst_QFutureWatcher fails on Android
• QTBUG-100775 Several data races around handlers of
  QDesktopServices::openUrl()
• QTBUG-100482 Network monitoring not working when ZScaler Internet
  Security is active
• QTBUG-87405 tst_QFontDatabase::systemFixedFont fails for Android
• QTBUG-88137 tst_QTimeLine fails on Android
• QTBUG-87400 tst_QAbstractItemView fails on Android
• QTBUG-87408 tst_QTreeView has failing tests
• QTBUG-100574 qtbase/src/gui/vulkan/qvulkanfunctions_p.cpp is missing
  dependency on qvkgen tool
• QTBUG-100364 QStandardPaths GenericDataLocation for iOS seems to
  mention wrong path
• QTBUG-100518 Crash on iOS 13.3.1
• QTBUG-100261 QPrinter property setup not effect
• QTBUG-99504 Linux: QPrinter::setDuplex not effective ( Canon
  imageRUNNER 2520 )
• QTBUG-100915 moc code generates warning [-Wredundant-parens]
• QTBUG-52472 Undefined Behaviour in qsimpledrag.cpp line 207
• QTBUG-45045 SIGFPE in QQuickMenu
• QTBUG-81917 QtWidgets fails to build with clang 10.0-rc1 in C++20 mode
• QTBUG-99368 TLS handshake fails due to incorrect cipher handling
  (Secure Transport macOS backend)
• QTBUG-81583 QTextMarkdownWriter: if a task list item's first line ends
  with monospace text, trailing backtick is omitted
• QTBUG-99775 Crash on QObject::objectName access when using QThreadPool
  from non-owning thread
• QTBUG-99009 QCursor::setPos X coordinates is wrong when DPI scaling is
  used
• QTBUG-92909 When following redirects, a PROPFIND request (and probably
  others) are converted to a GET
• QTBUG-99803 QVulkanWindow doesn't enable any device features (e.g.
  VkDeviceCreateInfo::pEnabledFeatures)
• COIN-762 Coin's configure command gets warning about unused
  -DBUILD_EXAMPLES=OFF
• QTBUG-99506 Loader with states and children loaders crashes on
  Integrity (release only)
• QTBUG-95764 pure virtual call in QAccessibleQuickItem
• QTBUG-98478 tst_QFileSystemWatcher::signalsEmittedAfterFileMoved fails
  in QtBase with Windows 11
• QTBUG-6905 font-weight: bold can truncate tab label
• QTBUG-100412 tst_qsrceen::grabWindow is flaky on Windows
• QTBUG-99491 Windows - Android App, cmake build does not update
  correctly if app library is bigger than 2GB
• QTBUG-100651 Unable to follow HTTP/2 redirects
• QTBUG-45582 Duplicated vtables due to inline virtual functions
  (probably all dtors)
• QTBUG-93396 Android A11Y TalkBack: Slider does not announce value on
  change
• QTBUG-100401 QToolbutton with popupMode QToolButton::InstantPopup and
  stylesheet have 2 arrows
• QTBUG-100790 tst_QInputDevice::multiSeatDevices() fails on Wayland
• QTBUG-100891
  tst_QGuiApplication::genericPluginsAndWindowSystemEvents() fails on
  Wayland
• QTBUG-100792 tst_QScreen::grabWindow() fails on Wayland
• QTBUG-66818 tst_QWindow::initialSize fails on Wayland
• QTBUG-100887 tst_QWindow::mouseToTouchTranslation() fails on Wayland
• QTBUG-100888 tst_QWindow::modalWindowPosition() fails on Wayland
• QTBUG-100889 tst_QWindow::requestUpdate() fails on Wayland
• QTBUG-100930 tst_QGraphicsWidget::updateFocusChainWhenChildDie fails
  on QNX
• QTBUG-100929 tst_QImage::hugeQImage fails on platforms without
  adequate memory
• QTBUG-87674 qaccessibility fails on Android