Wrong rendering of black keys
Virtual MIDI controller for Linux, Windows and OSX
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There is a bug in Qt 5.14.0 that renders the black keys gradients at wrong positions. As a workaround, in the SVN repository the commit [r526] replaces the SVG graphics by PNG.
Anybody interested in this bug, please vote and watch QTBUG-80954
Fixed in v5.14.1 :QTBUG-80888