Use Qt::AA_UseHighDpiPixmaps

[jcfr]

SlicerCustomAppTemplate/{{cookiecutter.project_name}}/Applications/{{cookiecutter.app_name}}App/q{{cookiecutter.app_name}}AppMainWindow.cxx

Lines 75 to 78 in c463c1a

	#if (QT_VERSION >= QT_VERSION_CHECK(5, 0, 0))
	qreal dpr = sqrt(qApp->desktop()->logicalDpiX()*qreal(qApp->desktop()->logicalDpiY()) / (qApp->desktop()->physicalDpiX()*qApp->desktop()->physicalDpiY()));
	logo.setDevicePixelRatio(dpr);
	#endif

@dzenanz Instead of this approach (which lead to huge logo in the case of non-dpi), I suggest we use Qt::AA_UseHighDpiPixmaps.

[dzenanz]

That was basically a quick fix. A proper support for varying DPI would be great!

[jcfr]

Closing. Issues related to high dpi have been addressed in these commits:

• ce3355b23 (BUG: Remove device pixel ratio)
• Slicer/Slicer@11ac58706 (ENH: Improve resolution of splashscreen and welcome icon)
• Slicer/Slicer@d2d11ddf8 (ENH: Switch to new Slicer logo in module panel)