QColor stores RGB colour with 16 bits per channel, so "0.5" would
convert to 32768 (i.e. round(0.5 * 65535)), or 0x8000.
If you convert down to 8 bits per channel, you'll have 0x80. If you
convert that value back up to 16 bits per channel, you'll have 0x8080.
And finally, converting that to floating point gives you 0.50196.
So you'll probably need to adjust the tests to accept an error on the
order of 1/(2*255) in these values.
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Text.color can't be compared reliably
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