Release note

Qt 6.2.3 release is a patch release made on the top of Qt 6.2.2.
As a patch release, Qt 6.2.3 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 6.2.2.

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

• fa2197202a Do not include qloggingcategory.h in public headers
  The qguiapplication.h header no longer implicitly includes
  qloggingcategory.h. If your code depends on the transitive include,
  explicitly include where needed.

• c13101b0b3 Fix deserializing Qt 5.x fonts through QDataStream
  Fixed a problem deserializing the family of fonts that had been
  serialized using QDataStream in Qt 5.

• 5d344408cc QAnyStringView: fix broken implicit conversion from
  QStringBuilder
  Implicit conversion from QStringBuilder to QAnyStringView now works as
  advertised.

• 03274775ec QImageReader: check allocation limit for minimum 32 bpp
  When checking allocation limit during image reading, the memory
  requirements are now calculated for a minimum of 32 bits per pixel,
  since Qt will typically convert an image to that depth when it is used
  in GUI. This means that the effective allocation limit is significantly
  smaller when reading 1 bpp and 8 bpp images.

• b55957b904 QObject: don't #include qproperty.h
  The qobject.h header no longer implicitly includes qproperty.h. If your
  code depends on the transitive include, explicitly include
  where needed.

• ac9cc22c09 QVERIFY_EXCEPTION_THROWN: re-throw unknown exceptions
  Now re-throws unknown exceptions (= not derived from std::exception)
  (was: swallowed them and returned from the test function), in order to
  play nice with pthread cancellation.

• 440a87248e QSharedPointer: fix counter-productive QT_PREPEND_NAMESPACE
  use in qHash() impl
  The qHash(QSharedPointer) overload can now use qHash(X) overloads
  found (only) through ADL (was: ADL was disabled due to qualified lookup
  of qHash(X)).

• 150a897a83 Fix gaps between lines of selection
  Fixed an issue where there would sometimes be visible gaps in
  selections spanning multiple lines.

• f622090b1d QNAM: Disable h2c by default
  Support for clear-text http/2 was disabled due to incompatibility with
  certain servers. If you were relying on this feature you must re-enable
  it by setting the QT_NETWORK_ALLOW_H2C environment variable. For a later
  version of Qt it will get a dedicated attribute.

• 669b454378 Add _make_aab target
  Add the extra _make_aab targets for each executable target, that can be
  used to generate android app bundles. Also add aab metatarget to build
  all _make_aab targets that are created in the project.

• ec613a4649 Fix overlapping text for Osaka font on macOS
  Fixed a problem where using the Osaka font would lead to overlapping
  text.

• 9a9d960b12 QFuture: support cancellation of continuation chain through
  parent
  The chain of continuations attached to a future now can be cancelled
  through cancelling the future itself at any point of the execution of
  the chain, as it was documented. Previously canceling the future would
  cancel the chain only if it was done before the chain starts executing,
  otherwise the cancellation would be ignored. Now the part of the chain
  that wasn't started at the moment of cancellation will be canceled.

• 46599ec418 Fix missing characters or assert with certain font sizes
  Fixed an issue where characters would in some rare cases be missing
  from text, depending on font metrics, font size and system scale factor.

• 3bf23b7118 Don't change resolve mask when setting brush doesn't change
  palette
  Setting a brush on a palette that is identical to the current brush no
  longer sets the resolve mask bit for that particular role, so items
  using the palette will continue to inherit changes from parent items.

• 82e965c35e QVarLengthArray: fix size update on failed append()
  Fixed a bug whereby a failed append() would leave the container with an
  inconsistent size().

• 52c9543475 QVarLengthArray: fix UB (precondition violation) in range-
  erase()
  Fixed a bug where range-erase() could invoke undefined behavior when
  called with an empty range.

• c721dff3f3 Trust CoreText-provided vertical metrics on macOS
  Fixed an issue where certain fonts, such as Monaco, would have a
  different line spacing than expected.

• b05c9898cc QList: fix typo in QList(It, It)
  Fixed a regression that caused the range constructor to fail for pure
  input_iterator's.

• 4e669763bd QVarLengthArray: widen append(p, n)'s contract
  The counted-range-append() function (append(ptr, n)) now accepts ptr ==
  nullptr, provided n == 0, too (was: triggered assertion).

• f3842c09b7 QVariant: use a typedef name when saving user types to
  QDataStream
  If QDataStream is used with a QDataStream::Version < Qt_6_0 to
  serialize a user type that was registered via a typedef with the
  metatype system, the typedef's name is used in the stream instead of the
  non-typedef name. This restores compatibility with Qt 5, allowing
  existing content to read the same QDataStreams; reading from older Qt 6
  versions should not be affected. (Note: if more than one typedef name is
  registered, it's indetermine which name gets used)

• 0952ec8a5f QStringBuilder: fix quadratic behavior in op+=
  Fixed quadratic behavior when repeatedly appending string-builder
  expressions (using operator+=) to QString/QByteArray objects.

• 7f3ca223a6 QTestData: fix streaming of u8 string literals in C++20
  mode
  Fixed streaming of u8 string literals in C++20 mode.

• 60f3d7f324 QByteArray: avoid detach() in a no-op replace()
  A replace(pos, n, after) call no longer detach()es when n ==
  after.size() == 0.

• 3d446c236a SQLite: Update SQLite to v3.37.0
  Updated SQLite to v3.37.0

qtdeclarative

• 72402a9160 Fix missing glyphs when changing distance field parameters
  Fixed an issue where glyphs would sometimes be missing when changing
  the environment variables that define how distance fields are generated
  to certain values.

• 9e6274e180 qquickdeliveryagent: Fix drag events being sent in the
  wrong order
  Now sends DragArea leave events before enter events when appropriate
  (QTBUG-82263)

• db9adec4b1 Fix focus for items inside a QQuickWidget in a
  QGraphicsProxyWidget

• 0798e34ce6 Make atlasing of compressed textures opt-in again
  Disable atlasing of compressed textures by default. Can be enabled with
  QSG_ENABLE_COMPRESSED_ATLAS=1

qtwayland

• 048f4317 Don't build XComposite buffer integration by default

qtlottie

• d234a3c Fix loading of LottieAnimation::source
  Fixed bug that prevented LottieAnimation from loading its source from a
  relative URL.

Fixes

qtbase

• QTBUG-98099 Crash on exit with Application font and QFontComboBox
• QTBUG-97908 Regression: PageUp and PageDown don't work in QScrollArea.
• QTBUG-90352 Page Up/Page Down do not work in QTextBrowser
• QTBUG-26269 QScrollArea: The viewport bleeds through another widget
  when the scroll bar is reset.
• QTBUG-98093 QSlider is broken in MacOS Monterey
• QTBUG-97995 Error deserializing QFont (from 5.15 to 6.2)
• QTBUG-98377 QImage::reinterpretAsFormat wrong reference counting when
  out of memory
• QTBUG-98403 tst_QPainter fails with macOS 12 x86 in developer build
  tests
• QTBUG-98388 Vertical QPainter::drawLine() result on QWidget is skewed
• QTBUG-97490 Static Build is unable to find QPrinter::NativeFormat
• QTBUG-98137 Disabled button in QDialogButtonBox gets focus by Tab
• QTBUG-98138 QAnyStringView argument doesn't accept QStringBuilder
• QTBUG-95933 Using scanner input IRcode will result in an error when
  second character is uppercase
• QTBUG-98280 QAuthenticator doesn't check if algorithm is supported
• QTBUG-94036 tst_QAccessibilityMac::notificationsTest() fails
• QTBUG-96405 setGraphicsApi :OpenGLRhi. QML application resizing
  flickers and is sometimes blank
• QTBUG-98286 Reg->Qt 6: QToolButton with style sheet : There are two
  Tool button arrows rendered (all styles)
• QTBUG-98544 Combination of 'HangulInputMethod' and 'QGraphicsTextItem'
  does not work as expected.
• QTBUG-98372 Regression Qt5 > Qt6: Visible gaps between selected lines
• QTBUG-98770 QList::count(const T&) triggers undefined behavior
  sanitizer when list is empty
• QTBUG-98289 QTableView : The last column/row is hidden by scrollbar
  when stylesheet is used.
• QTBUG-92521 WASM: QToolTips occasionally makes app exception
• QTBUG-91691 [REG: 5.15.0->5.15.1] QTextDocument tables with colspan
  collapses the starting column to minimum size
• QTBUG-95240 QTextTabel: column width changes when merging other rows
• QTBUG-97431 WASM - Tumbler does not work good/at all
• QTBUG-92037 QMdiArea setActiveSubWindow sublist.at(0) failed if
  setViewMode(QMdiArea::TabbedView);
• QTBUG-96710 CMake isn't exposing an aab target for Android projects
• QTBUG-96880 New line is ignored with Osaka font
• QTBUG-98493 Using copy-restricted class in lambda for QFuture's
  then(), does not build
• QTBUG-86372 [xcb] WindowTransparentForInput causing problems with
  resizing
• QTBUG-98578 Documentation of qabstractnativeeventfilter
• QTBUG-86633 QML - letters randomly disappear when resizing label
• QTBUG-86671 Table cells overlap with image and relative width
• QTBUG-97463 Showing Large image in QTextBrowser table overlaps
• QTBUG-98444 QTableView, Deselecting column by [ctrl + click] on
  horizontal header only works when the first row is visible
• QTBUG-98532 CMake - _qmltyperegistration.cpp do not get updated
• QTBUG-98752 QFontDatabase::addApplicationFontFromData does not mention
  OpenType being supported
• QTBUG-62602 Underline is displayed outside the text box
• QTBUG-97649 androiddeployqt exits with signing if the path contains
  spaces
• QTBUG-98504 QSystemTrayIcon example: selecting Quit from context menu
  shows unnecessary message
• QTBUG-98762 REGRESSION: QPalette::setBrush does not reliably detach
• QTBUG-65475 Application palette changes at runtime do not work for all
  widgets
• QTBUG-98654 QX11Application: No such file
• QTBUG-98875 QMouseEvent source() vs pointingDevice() unclear in
  documentation
• QTBUG-82455 QTextDocument::contentsChange(int,int,int) values are
  incompatible with QTextCursor
• QTBUG-72776 QKeyEvent key() only returns value of first surrogate for
  characters in Supplementary Planes
• QTBUG-58995 [REG 5.7->5.8][Windows]: When using Courier with a large
  pixel size then it will show up as 13 points regardless
• PYSIDE-1720 piside6-uic convert signal clicked(bool) to clicked
• QTBUG-95192 Segmentation fault at application closing
• QTBUG-80653 Keyboard LED states do not change with evdev keyboard
• QTBUG-98726 CMake code for locating latest android.jar in Android SDK
  is incorrect
• QTBUG-68636 Some popups (i.e.) menus are misplaced on gnome-shell
• QTBUG-98856 Wrong cursor showing when restoreOverrideCursor in
  QDockWidget
• QTBUG-95096 Qt 6's new and improved QList fails its removeAll
  benchmarks
• QTBUG-94995 Changed QML files do not updated on device
• QTBUG-98943 QMultiHash recursive emplace on VS2019
• QTBUG-97818 Huge line spacing when font is Monaco
• QTBUG-99036 [REG 5.15 → 6.3] QList(It, It) no longer works with pure
  input_iterators
• QTBUG-97699 Building projects with static Qt (debug):
  qrc_openglblacklists.cpp.obj : warning LNK4099: PDB 'vc140.pdb' was not
  found with 'qrc_openglblacklists.cpp.obj'
• QTBUG-92501 QtFuture::connect includes Q*::QPrivateSignal as one of
  the arguments
• QTBUG-98843 Qt 6.2.2 Windows build fail
• QTBUG-96463 [REG 5.15.2-6.2.0] Text with BIDI controls is underlined
  incorrectly
• QTBUG-99165 cmake doesn't complain with android-30, but fails with
  unknown API S (ie android-31)
• QTBUG-99223 CMake Error: File
  C:/Users/qt/work/install/lib/cmake/Qt6/qt_setup_tool_path.bat.in does
  not exist.
• QTBUG-97752 QHash: non-readonly iteration access destroys iterator
• QTBUG-96916 Qt 6 breaks compatibility of QVariant streaming into
  QDataStream
• QTBUG-81503 qtbase contains code that isn't allowed to be distributed
• QTBUG-98901 QtConcurrent::run crashes on program exit
• QTBUG-99163 QTransform rotate big image will crash
• QTBUG-99280 Splash screen appears on top model dialog with dynamic vs
  behind with static
• QTBUG-99330 qdoc: Crash at QString::operator+=()
• QTBUG-99186 uncaught exeption takes down app
• QTBUG-99319 QApplication crash on second run when mouse roll over
  window
• QTBUG-99371 QWidget::customContextMenuRequested coordinates are off
  for widgets in a QMenu
• QTBUG-99147
• QTBUG-99413 QSysInfo::productType() incorrectly documented
• COIN-777 *** Could not find any device matching '--platform iOS
  --minimum-deployment-target
• QTBUG-63695 QStandardPaths does not document locations for QNX
• QTBUG-99316 Yocto build fails in CI for qtdeclarative-native dev/6.3
  branch
• QTBUG-99416 QT6 qtbase build fails claiming symlinks are present
• QTBUG-99148 Broken html list rendering because element
• QTBUG-97841 MacOS Monterey - scrolling issues with touch pad
• QTBUG-99623 Dependency update on qt/qtopcua failed in 6.3
• QTBUG-99408 [SQL] The SQL driver for Firebird/Interbase does not
  unpack the QVariant before null check
• QTBUG-98471 [REG: 5->6.2.1] Null QDateTime is not stored as NULL
  anymore in Oracle OCI
• QTBUG-99710 Regression: QCache crash
• QTBUG-99224 Crash in QPixmapCache
• QTBUG-99240 Crashing in trimming QPixmapCache
• QTBUG-99668 Using QDateTime with QTimeZone specified asserts in debug
  build
• QTBUG-97601 Compilation speed decrease with Qt 6.2 compared to Qt
  5.15.2
• QTCREATORBUG-26581 Multicursor mode enables during the selection
  without pressing "Alt"
• QTBUG-97842 Move Android tools docs from qtdoc to qtbase
• QTBUG-97115 When an application that is using a background service is
  closed then it will cause an ANR after hanging for about 30 seconds
• QTBUG-95795 Crash when running a qt quick app on iOS simulator
• QTBUG-98569 Error in meta-b2qt for Windows Toolchain
• QTBUG-98653 QStringView::split returns invalid data
• QTBUG-98642 Qml/QmlScene : malformed http request when opening a qml
  file over http with qml/qmlscene
• QTBUG-93037 Conan builds are unable to run tst_qmake
• QTBUG-97582 QFuture::cancel through then()/onCanceled/onFailed
• QTBUG-98649 Qt Android creates View IDs in a way potentially leading
  to a collision
• QTBUG-75862 FocusReason is broken in Controls 2
• QTBUG-96957 Created output file is in inncorrect type and in different
  location
• QTBUG-92231 SSL handshake failure after ignoreSslErrors
• QTBUG-98151 Widgets over a QMdiArea are not repainted correctly
• QTBUG-98561 Creating directory using symbolic link in path fails on
  QNX
• QTBUG-89285 Document changes to State Machine Framework in Core
  Migration Guide
• QTBUG-95237 [REG 6.0.4 -> 6.1.0] Integer-overflow in
  QFixed::operator+= through QImage::loadFromData(QByteArray)
• QTBUG-98483 [macOS] QPushButton is broken in macOS Monterey
• QTBUG-98937 KTX, ASTC image not displayed on Qt 6.2 and above
• QTBUG-99615 Most QMutableEventPoint usage depends on Undefined
  Behaviour