Qt 5.9.3 is a bug-fix release. It maintains both forward and backward
compatibility (source and binary) with Qt 5.9.0 through 5.9.2.

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.

****************************************************************************
*                               Qt 5.9.3 Changes                           *
****************************************************************************

QtCore
------

 - QFileSystemWatcher:
   * [QTBUG-64171] Fixed a bug that would cause the application to crash if
     QFileSystemWatcher was created in an auxiliary thread on Windows.

 - QStorageInfo:
   * [QTBUG-61420] Fixed decoding of volume labels containing certain
     uncommon characters on Linux.

 - QThreadPool:
   * Improved performance with large amount of QRunnable items.

QtGui
------

 - [QTBUG-64239] Fixed memory corruption on scaled emojis.
 - [QTBUG-63846] Fixed dragging inside a modal window when a
   QShapedPixmapWindow is used.
 - [QTBUG-61777] Fixed painting of zero-length lines with scaling.
 - [QTBUG-61244] Fixed centering of some items in layouts.
 - [QTBUG-63168] Fixed a crash when reparenting QWindowContainer.


QtNetwork
---------

 - QHostAddress:
   * [QTBUG-63764] Fixed a problem in QHostAddress not detaching in its
     setters and thus spoiling shared data.

 - QNetworkAccessManager:
   * [QTBUG-63075] Added support for HTTP status 308.
   * [QTBUG-61300] Fixed a problem with mixing headers from different
     responses.
   * [QTBUG-63471] Fixed redirects support in HTTP/2 protocol handler.
   * [QTBUG-63313] Fixed cookies received during a redirect not being
     applied in the redirect.
   * [QTBUG-63142] Fixed HTTP method always being changed to GET when
     redirected with 307 and 308.

 - QNetworkCookieJar:
   * Fixed cookies with a root path ("/") not matching an empty path ("").

QtSql
------

 - PostgreSQL:
   * Fixed handling of binary data for PostgreSQL 9.x and later
   * Fixed detection of PostgreSQL 9.x and later

 - OCI:
   * [QTBUG-57765] Fixed a bug that would see some cached results returned
     when issuing a forward only query

QtWidgets
---------

 - QAction:
  * [QTBUG-62006] Ensured setData() does not emit changed() if no change
    happened.

 - QDockWidget:
  * [QTBUG-63526] Fixed an issue in QDockWidgets where the widget would
    not resize despite showing a resize cursor.

 - QHeaderView:
   * [QTBUG-54601] Fixed resizing when hidden sections were involved.
   * [QTBUG-64036] Ensured maximumSectionSize property is honored during
     resizeSections().

 - QListView:
   * [QTBUG-45427] Fixed the laying out of a QListView in a grid layout
     after the dataChanged() signal is emitted.

 - QMenuBar
   * [QTBUG-34160] Fixed a problem with adding the same QAction to more than
     one menu.

 - QWidget
   * [QTBUG-56860] Fixed widget losing focus after showing menu second time.

 - QWizard:
   * [QTBUG-46894] Fixed the shortcut for the Next button on Windows.


Platform-specific changes
-------------------------

 - Cocoa:
   * optimize backingstore flush on 10-bit displays
   * [QTBUG-57076] [QTBUG-63712] Attach menu items when updating the menubar
   * [QTBUG-63444] Toggle titlebar transparency to support unified toolbar

 - iOS:
   * [QTBUG-57428][QTBUG-63660] add support for adding mimetypes other than text
   on the clipboard

 - Windows:
   * [QTBUG-63654] Windows font database: Remove clamping of default font size

 - X11:
   * [QTBUG-48034] Don't misdetect certain trackballs as tablets
   * [QTBUG-62840] Fix crash on X servers with BGR888 display

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

 - Improved documentation about Freetype 2 licenses.
 - Updated Sqlite to fix CVE-2017-10989.
 - Updated bundled libpng to version 1.6.34.

Tools
-----

 * qmake:
   - [QTBUG-63409] Fixed a build error with MSVC when concrt.h was included
     while exceptions are disabled.
   - [QTBUG-62985] Fixed a bug that caused the accidental creation of files
     called "NUL" when using MinGW.