changes-5.12.4

Qt for Python 5.12.4 is a bug-fix release.

For more details, refer to the online documentation included in this
distribution. The documentation is also available online:

https://doc.qt.io/qtforpython/

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.

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*                                  PySide2                                 *
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 - [PYSIDE-571] correct bool(qApp) on Python 2
 - [PYSIDE-735] generate_pyi: Simplify, Enhance and Get Rid Of Any Import Problems
 - [PYSIDE-865] opengl/contextinfo.py: Fix exception on exit
 - [PYSIDE-865] opengl/contextinfo.py: Polish the example a bit
 - [PYSIDE-908] Complete the help() support for Types
 - [PYSIDE-955] Add PySide2: Add OpenGL version functions as separate module
 - [PYSIDE-980] CMake: Change the default behavior CMAKE_BUILD_TYPE
 - [PYSIDE-996] Fix PyInstaller after removal of COIN glitches
 - [PYSIDE-1003] Fix Shiboken.ObjectType.__new__ for Python 2.7 V2
 - [PYSIDE-1004] Make the __signature__ attribute writable by default
 - [PYSIDE-1008] Fix propagation of existing LD env vars when calling generate_pyi
 - [PYSIDE-1009] Signature: Try to recognize unknown modules in errorhandler.py
 - [PYSIDE-1012] Fix build on centOS/conda forge
 - [PYSIDE-1019] PySide: Allow any existing attribute in the constructor
 - [PYSIDE-1022] TabbedBrowser Example: Fix "Open in new tab"
 - [PYSIDE-1027] Fix negative refcount on QSocketNotifier

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*                                  Shiboken2                               *
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 - [PYSIDE-955] shiboken/Generators: Cache class information lists per class
 - [PYSIDE-1016] shiboken: Fix handling shared pointers passed by const-ref, take 2
 - [PYSIDE-1017] shiboken: Enable specifying names for a parameters of added functions