[Development] High-DPI 5.6 beta update

[Tim Blechmann]

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>>>> Your thoughts on projects that use ONLY SVG image resources
>>>> and not PNG/JPEG?
>>> 
>>> But the above:
>>> 
>>> 1) already works
>> 
>> kind of ... the above will rasterize the svg for the resolution
>> of the Image which is then upscaled, to match the resolution of
>> the screen, resulting in a blurry rendering :/
> 
> What you describe is QTBUG-38991 which we fixed in Qt 5.5 already

just setting the image source to an svg will still result in a blurry
rendering in 5.5 and 5.6. i have to work around this by setting the
source size explicitly, as it doesn't take the devicePixelRatio into
account ...
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