[Interest] single application

[Nils Jeisecke]

Hi Duane,

> To prevent multiple instances, we are using QSingleApplication.  On Windows, if the
> app is started from the desktop this works fine but if it's started from
> a console a second instance can be started.
please try to apply the patch from
https://codereview.qt-project.org/#change,44118 and report if this
solves your problem.

Thanks

Nils