Qt 4.2.2 is a bug-fix release. It maintains both forward and backward

compatibility (source and binary) with Qt 4.2.0.

The Qt version 4.2 series is binary compatible with the 4.1.x and 4.0.x

series. Applications compiled for 4.0 or 4.1 will continue to run with 4.2.

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*                           General                                        *

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General Improvements

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- Configuration/Compilation

  * Fixed issues with unresolved zlib symbols on aix-g++ resulting from a

    missing "-lz" in gui/Makefile.

  * Fixed compilation when an unsupported version of MySQL is auto-detected

    by the configure script.

  * Fixed QtDBus linking errors when compiling with the Intel C++ Compiler

    for Linux.

  * Fixed compilation when using Q_ARG and Q_RETURN_ARG macros with template

    types.

  * Make Qt compile with QT_NO_TOOLTIP and QT_NO_STATUSBAR

- Documentation

  * Added new overviews and substantially improved Qtopia Core-specific

    documentation.

- Demos / Examples

  * Fixed crash in the Settings Editor example resulting from entering

    certain input to a QTreeWidget using QLineEdit as an inline editor.

  * Fixed crash in the Ported Canvas example that occurred when creating a

    new canvas from one that was shrunk to its minimum size.

- I/O

  * Fixed divide by zero when loading malformed BMP files.

- Qt Assistant

  * Fixed a bug that prevented the view from scrolling to anchors within

    pages.

- Qt Designer

  * Fixed crash that could occur when pasting a QGridLayout into a

    QTabWidget.

  * Fixed the signals & slots connection editor to automatically scroll to 

    the correct items.

  * Fixed blocking behavior that would occur when previewing modal forms.

  * Made OK the default button in the "Promote to Custom Widget" dialog.

  * Ensured that main window forms that include size grips are repainted

    correctly when they are resized.

  * Fixed bug in Form Settings dialog - it wasn't possible to reset the

    "Pixmap Function" field.

- Qt Linguist

  * Fixed bug where lupdate would leave out the namespace part of the context.

  * Fixed bug in lupdate where the paths of the generated ts files was not 

    relative to the pro file.

  * Fixed bug in lupdate that caused strings that contained \r\n were not 

    translated.

  * Improved the user interface with some minor layout changes.

  * Improved handling of forms without layouts.

  * Fixed crash caused by navigating to the previous node when the current

    node was the first and topmost node.

  * Fixed bug in the preview translation feature where forms that did not

    have any layout got a height of 0.

  * Fixed bug where "Search and Translate" did not trigger a repaint on the

    items that got translated, leading people to believe that 

    "Search and Translate" did not work.

  * Fixed a layout problem with the "Search and Translate" dialog.

- qmake

  * Fixed crash that could occur when using the LIB_PATH variable if a .libs

    directory is located on one of the paths held by the variable.

  * Improved generation of Xcode projects to avoid problems with qmake

    project files that contain certain Qt-dependent declarations.

  * Improved support for Objective C sources in the Xcode project generator

    to ensure that they are added to the project's target.

Third party components

----------------------

- libpng

  * Security fix (CVE-2006-5793): The sPLT chunk handling code

    uses a sizeof operator on the wrong data type, which allows

    context-dependent attackers to cause a denial of service (crash)

    via malformed sPLT chunks that trigger an out-of-bounds read.

  * Security fix: Avoid profile larger than iCCP chunk.

    One might crash a decoder by putting a larger profile inside the

    iCCP profile than is actually expected.

  * Security fix: Avoid null dereference.

  * Disabled MMX assembler code for Intel-Mac platforms to work

    around a compiler bug.

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*                          Library                                         *

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

General improvements

--------------------

- Accessibility

  * Fixed a potential assert when navigating menus while assistive tools are

    running.

  * Fixed a crash when getting accessibility information from an item view

    without a model.

  * Fixed item view accessibility bug where QAccessibleInterface::text()

    would return an empty string for child indexes larger

    than one.

- Item views

  * Fixed QHeaderView and QTableView overflow issues when the length

    of all the rows or columns went over the maximum allowed integer value.

  * When reset is emitted by a QAbstractItemModel, QHeaderView will now

    always update the header count().

  * Fixed incorrect scrolling in QHeaderView when items are hidden.

  * Fixed bug where QHeaderView would disappear if the sections were moved

    and the model was reset.

  * QDataWidgetMapper::mappedWidgetAt() now always returns the right

    mapped index for a widget no matter in which order they were inserted

  * Fixed crash due to incorrect update of persistent model indexes in

    QSortFilterProxyModel::layoutChanged().

  * Fixed bug that could cause QSortFilterProxyModel::removeRows() and

    QSortFilterProxyModel::removeColumns() to remove the wrong source model

    items.

  * Fixed bug in QSortFilterProxyModel that caused stale proxy mappings to

    remain when source model items were removed and later reinserted,

    resulting in an incorrect proxy model.

  * Fixed bug in QSortFilterProxyModel that caused items to not appear

    in a QTreeView when adding children to a formerly childless source item.

  * Fixed painting bug for spanning cells in QTableView when the item

    background is transparent.

  * Fixed regression in QListWidget and QTreeWidget that caused persistent

    indexes to not be updated when sorting items.

  * Enter key can now be used to start item editing when the edit trigger

    is AnyKeyPressed.

  * Fixed regression where QAbstractItemView::setRootIndex() wasn't

    always updating the view, causing possibly painting errors.

  * Fixed regression that caused incorrect propagation of Enter key press

    from a QAbstractItemView in editing mode.

  * Date and time editors are now initialized correctly with the current

    date and time.

  * QTableView tab focus handling has been improved. Although tab key

    navigation is enabled by default, you can tab out of a view if the

    model is either missing or unable to handle the key (e.g., an empty

    model).

  * Fixed bug in QItemDelegate that would scale decoration pixmaps.

  * Fixed buge that would not let the column delegate create the editor

    for an edited item.

  * Fixed bug where the QTableCornerButton would ignore the view

    selectionMode.

  * Fixed compatibility issue with QTreeWidgetItem serialization

    between Qt 4.2.x and Qt 4.(0/1).x.

  * Made sure the QTableWidget::cellEntered() signal is emitted

    correctly.

  * Made sure that commitData() uses the row/column delegate

    when these are set.

  * Fixed incorrect QTableView scrollbar ranges when rows were hidden.

  * Fixed QItemDelegate to let text be bottom aligned.

- Graphics View

  * The background cache in QGraphicsView is now properly initialized to

    the full viewport.

  * Fixed incorrect cursor updates when moving between items.

  * QGraphicsItem::setMatrix() now properly clears the original item before

    repainting.

  * QGraphicsEllipseItem is now only drawn as a full ellipse at angles that

    are multiples of 360 degrees (..., -720, -360, 360, 720, ...).

  * Fixed a crash when selecting one selectable item, then moving another

    movable item.

  * Fixed a crash during item construction caused by a pure virtual function

    call in QGraphicsItem.

  * Fixed mouse grabber book-keeping problems in QGraphicsScene which fell out

    of sync when opening modal dialogs or popups from within a mouse event

    handlers.

  * QGraphicsScene now forwards unhandled events to QObject, allowing the use

    of timers in QGraphicsScene subclasses.

- Meta-Object Compiler (moc)

  * Split long string literals in the generated code to work around

    limitations in MSVC.

  * Fixed crash on *BSD that could occur on invalid input.

- Painting

  * Improved numerical stability in the path stroker, fixing a crash when

    stroking paths containing curve segments whose control points are

    approximately on the same line.

  * Fixed raster paint engine memory corruption in QBitmap when source buffer

    was smaller than the destination buffer.

  * Avoid rounding errors when drawing parts of a pixmap using the Quartz 2D

    engine.

  * Added caching of QGradient's color table for the raster paint engine.

    This means that if a gradient with the same stops and colors is used

    again, it will be quickly fetched from the cache, avoiding the

    expensive calculations of the color lookup table.

  * Fixed a crash on Windows and with QImage caused by specifying

    Qt::CustomDashLine without an actual pattern.

  * Fixed a bug in the raster paint engine which would occasionally cause

    pixel errors when drawing polygons.

  * Fixed memory corruption in the OpenGL paint engine when drawing complex

    polygons with a cosmetic pen.

  * Fixed rendering of transformed brushes when drawing linear gradients

    with the OpenGL paint engine where the transformations used were not

    angle-preserving.

  * Improved handling of OpenGL errors.

  * Fixed bug in the raster paint engine where extra lines would be drawn

    when drawing a path partially outside the viewport using a dashed pen.

  * Fixed an assert in QImage that was triggered when reading PNG files

    with certain palettes.

  * Fixed an issue where stroking and drawing aliased QPainterPaths with a

    non-cosmetic pen would produce incorrect results.

  * Fixed an issue where text was cut off when drawn onto a QImage.

  * Fixed an issue where text would be drawn onto a QPicture with an

    incorrect position.

  * Fixed an issue where enabling/disabling clipping when drawing into a

    QImage did not have any effect.

  * Fixed bug in QImage::createHeuristicMask where the color table was not 

    initialized properly.

- Qt Resource Compiler (rcc)

  * Improved handling of relative paths in .qrc files.

- Style Sheets

  * Made general performance improvements.

  * Fixed crash that could occur when a widget with a style sheet was

    reparented into a widget with no style sheet.

  * Ensured that a widget's custom palette is not overwritten when not styled

    using a style sheet.

  * Added support to allow colors to be specified with alpha components.

  * Added support for group box styling.

  * Removed broken support for automatic image scaling.

- SQL plugins

  * Fixed incorrect translation of error strings in the Oracle plugin.

  * Made sure PQfreemem is called to free allocated buffers in PostgreSQL.

  * Fixed regression from Qt 4.1.4 behavior that prevented tables in schemas

    from working correctly in the SQL data models.

  * Prevented possible trailing garbage for TEXT fields in the MySQL plugin.

- Text handling

  * Fixed a bug in the Bidi algorithm.

- QAbstractItemView

  * Made commitData() more robust by ignoring cases in which no valid index

    is associated with the editor.

  * Ensured that the itemEntered() signal is emitted consistently on all

    platforms.

- QBrush

  * Ensured that transformations are correctly copied when brushes are copied.

- QCalendarWidget

  * Fixed setting the text format, correcting repainting and date resetting

    issues.

- QComboBox

  * Fixed wrong scroll arrows for the popup menu.

- QCompleter

  * Fixed issue where the highlighted() signal was emitted twice if

    setModel() was called twice.

  * Made completers usable inside dialogs.

- QDataStream

  * Fixed streaming of qreal on (embedded) platforms where qreal values are

    not equivalent to double values; i.e., sizeof(qreal) != sizeof(double).

- QDateTime/QDateTimeEdit

  * Fixed a bug that allowed you to type in larger numbers than 12 in 12-hour

    fields.

  * Fixed a bug that occurred when QDate::shortMonthName() was longer than

    3 characters.

  * Improved the handling of left-to-right languages.

- QDialogButtonBox

  * QDialogButtonBox now sets the default button to the first button with

    the Accept role if no other button has explicitly been set as the

    default when it is shown. This is to stop a regression where using the

    autoDefault property with the Mac and Cleanlooks styles would set the

    Cancel button as the default.

- QDir

  * Fixed an assert in QDir::entryList() when reading file entries with

    names containing invalid Unicode encodings.

- QFileDialog

  * Fixed bug that showed a non-existing folder for every space the user typed 

    after a dot (.) in the lineedit.

- QFileSystemWatcher

  * Fixed compilation on Linux/HPPA.

- QFSFileEngine

  * Fixed broken UNC path support.

- QIODevice

  * Fixed a data corruption bug when reading large blocks from devices

    opened in Text mode.

  * Fixed seeking to positions larger than the maximum allowed integer value.

- QLineEdit

  * Fixed scrolling in line edits with custom paddings.

  * Fixed crash on Linux when the text contains QChar::LineSeparator.

- QListView/QListWidget

  * Fixed bug with cursor navigation in cases where a grid size has been

    set.

  * Ensured that the drop indicator is not shown in icon view mode to avoid

    painting artifacts.

- QLocale

  * Fixed crash on Mac OS X and Windows caused when one of the separator

    strings was an empty string.

  * Fixed double to string conversion bug on embedded architectures.

- QMainWindow

  * Fixed bug allowing non-floatable dock widgets to be floated when the

    DockWidgetMoveable option is set.

  * Fixed several bugs in laying out docked QDockWidgets which have

    minimumSize() and/or maximumSize() set.

  * Improved saving and restoring of the state of main windows and their dock

    widgets when using saveState() and restoreState().

  * Fixed handling of dock widgets that are non-closable to the user so that

    they can be programmatically closed.

  * Fixed regression from Qt 4.1.4 behavior to ensure that palette changes

    to main windows are also propagated to their children.

- QMenuBar

  * Improved event handling to avoid sending events when a menu bar has no

    parent widget.

- QObject

  * Fixed memory leak when calling QObject::moveToThread(0).

- QPainter

  * Fixed reentrancy issue that would otherwise lead to crashes if more than

    one QImage is deleted at the same time (from different threads).

- QPalette

  * Improved handling of the palette obtained from QApplication::palette()

    in cases where QApplication::setStyle() has been called before a

    QApplication instance has been constructed (as recommended by the

    documentation).

- QPluginLoader

  * Fixed a potential crash that could occur when calling staticInstances()

    from a global destructor.

- QProgressBar

  * Document that drawing of text in vertical progress bars is style-dependent.

- QSqlRelationalTableModel

  * Ensured that the internal cache is correctly cleared when reverting

    inserted rows.

- QSvg

  * Improved parser robustness and parsing speed.

- QTextCodec

  * Fixed race-condition in QTextCodec::codecForLocale().

  * Fixed potential off-by-one string handling bug.

- QTextDocument

  * Fixed support for pixel font sizes in imported HTML.

- QTextOption

  * Ensured that the textDirection property is respected.

- QTextStream

  * Ensured that readLine() no longer treats "\r\n" as being two lines if

    called after QTextStream::pos().

- QToolButton

  * Fixed an issue where tool button popup menus were positioned incorrectly

    on multi-screen setups.

- QTreeView/QTreeWidget

  * Fixed possible assert when painting if there were layouts pending.

  * Fixed possible segfault when a model emits layoutChanged().

  * Fixed erroneous expanding/collapsing of items when the user

    double-clicked in the checkbox area of an item.

  * Fixed a crash in setRowHidden() caused by hiding then un-hiding items

    in a hierarchy.