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Qt Creator version 4.2 contains bug fixes and new features.

The most important changes are listed in this document. For a complete
list of changes, see the Git log for the Qt Creator sources that
you can check out from the public Git repository. For example:

    git clone git://code.qt.io/qt-creator/qt-creator.git
    git log --cherry-pick --pretty=oneline origin/4.1..v4.2.0

General

* Added experimental editor for Qt SCXML
* Added pattern substitution for variable expansion
  `%{variable/pattern/replacement}` (and `%{variable//pattern/replacement}`
  for replacing multiple matches)
* Added default values for variable expansion (`%{variable:-default}`)
* Added Help > System Information for bug reporting purposes
  (QTCREATORBUG-16135)
* Added option to hide the central widget in Debug mode

Welcome

* Added keyboard shortcuts for opening recent sessions and projects
* Improved performance when many sessions are shown

Editing

* Added action for selecting word under cursor (QTCREATORBUG-641)
* Fixed highlighting of Markdown files
  (QTCREATORBUG-16304)

Help

* Added option to open link and current page in window (QTCREATORBUG-16842)

All Projects

* Reworked Projects mode UI
* Grouped all device options into one options category
* Added support for toolchains for different languages (currently C and C++)

QMake Projects

* Removed Qt Labs Controls wizard which is superseded by Qt Quick Controls 2
* Fixed `Open with Designer` and `Open with Linguist` for mobile and embedded Qt
  (QTCREATORBUG-16558)
* Fixed Add Library wizard when selecting library from absolute path or
  different drive (QTCREATORBUG-8413, QTCREATORBUG-15732, QTCREATORBUG-16688)

CMake Projects

* Added support for CMake specific snippets
* Added support for platforms and toolsets
* Added warning for unsupported CMake versions
* Added drop down for selecting predefined values for properties
* Improved performance of opening project (QTCREATORBUG-16930)
* Made it possible to select CMake application on macOS
* Fixed that all unknown build target types were mapped to `ExecutableType`

Qbs Projects

* Made generated files available in project tree (QTCREATORBUG-15978)

C++ Support

* Added preview of images to tool tip on Qt resource URLs
* Added option to skip big files when indexing (QTCREATORBUG-16712)
* Added notification for parsing errors in headers
* Fixed `Move Definition to Class` for functions in template class and
  template member functions (QTCREATORBUG-14354)
* Fixed issues with `Add Declaration`, `Add Definition`, and
  `Move Definition Outside Class` for template functions
* Clang Code Model
    * Improved responsiveness of completion and highlighting

Debugging

* Added pretty printing of `QRegExp` captures
* Added pretty printing of `QStaticStringData`
* Improved pretty printing of QV4 types
* Made display of maps more compact
* Fixed pretty printing of `QFixed`
* LLDB
    * Added support for Qt Creator variables `%{...}` in startup commands

QML Profiler

* Added option to show memory usage and allocations as flame graph
* Added option to show vertical orientation lines in timeline
  (click the time ruler)

Qt Quick Designer

94
* Added completion to expression editor
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* Added menu for editing `when` condition of states
* Added editor for managing C++ backend objects
* Added reformatting of `.ui.qml` files on save
* Added support for exporting single properties
* Added support for padding (Qt Quick 2.6)
* Added support for elide and various font properties to text items
* Fixed that it was not possible to give extracted components
  the file extension `.ui.qml`
* Fixed that switching from Qt Quick Designer failed to commit pending changes
  (QTCREATORBUG-14830)
* Fixed issues with pressing escape

Diff Viewer

109 110
* Added local diff for modified files in Qt Creator (`Tools` > `Diff` >
  `Diff Current File`, `Tools` > `Diff` > `Diff Open Files`)
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111
  (QTCREATORBUG-9732)
112 113
* Added option to diff files when they changed on disk
  (QTCREATORBUG-1531)
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* Fixed that reload prompt was shown when reverting change

Version Control Systems

* Gerrit
    * Fixed pushing to Gerrit when remote repository is empty
      (QTCREATORBUG-16780)

Test Integration

* Added option to disable crash handler when debugging
* Fixed that results were not shown when debugging (QTCREATORBUG-16693)
* Fixed that progress indicator sometimes did not stop

Model Editor

* Added zooming
* Added synchronization of selected diagram in diagram browser

Platform Specific

Android

* Improved stability of determination if application is running
* Fixed that running without deployment did not start emulator
  (QTCREATORBUG-10237)
* Fixed that permission model downgrade was not detected as error
  (QTCREATORBUG-16630)
* Fixed handling of minimum required API level (QTCREATORBUG-16740)

Credits for these changes go to: