BTW, I have created a Sigil-0.9.13 with the just released Qt-5.12.2 plus a few extra bug fixes for Qt and Webkit and have opened a decent sized epub with it and let it sit open for 4 hours. When I left, it used up 283.0 Meg, when I returned to check it, it used 252.0 meg and has stayed that way ever since.
So Qt seems to have done a good job plugging that Mac only native window memory leak.
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