[Interest] Removal of GUIenabled constructor argument of QApplication in Qt5

[Marc Schmitzer]

Hi,

I know I'm a little late to the party, but while trying to port our
project to Qt5, I just discovered that the QApplication constructor that
takes a "bool GUIenabled" argument has been removed. I cannot find any
mention of this in the official change lists.

This change is quite unfortunate for us because we have some programs
with "runtime optional" GUIs. These programs would simply instantiate a
QApplication, passing true as the GUIenabled argument only if the
"DISPLAY" environment variable was not empty. This all worked nicely.
Now, without that constructor, I have to explicitly instantiate
QApplication or QCoreApplication on the heap and keep it in a pointer.

Another problem is that the change does not break existing code, because
the "normal" QApplication constructor (int&,char**) actually has a third
argument (int) that is hidden from the docs. This means that existing
code will continue to compile, but pass one or zero as the third
argument, which normally defaults to QT_VERSION (0x05****).

I realize that this is more of a complaint than a question, but maybe
somebody here can shed some light on the story.

-- 
Mit freundlichen Gruessen / Best regards

Marc Schmitzer

SW-Entwicklung ESWL / ESWT
Software development ESWL / ESWT

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