Increased pixmapCache size limit and made it dependent on devicePixelRatio (for HiDPI/Retina displays) #12416
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I noticed during profiling on Windows, that Mixxx sometimes renders SVG icons and the waveforms stuck slightly. I could fix this by increasing the pixmapCache limit for rendered SVGs and scaled CoverArt from 20MByte to 32MByte.
But these images increase all in size when HiDPI displays with higher zoom levels are used, therefore I consider this as well.
Furthermore I moved this general setting out off coverartcache.cpp.