Thanks, for your report. On Macs only ... under Qt 5.11.2 there is a native Window pointer that is leaked. This was long reported to Qt and Qt has fixed this leak in the Qt 5.12.2. As you said, it does not seem to impact performance or cause problems but it is nice to know this leak will be plugged in our next release that will include Qt 5.12.2.
That said, if someone does have a "killer epub" that would be helpful, would you please run the Sigil "Borkify" plugin on it to scramble the text (I think calibre can do the same thing) and post it someplace for us to test with via pm. It would be helpful especially in our memory leak testing.
Thanks,
KevinH
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