I just looked at the Qt website for bugs relateds to TreeModel and TreeView and there are lots of them (some even causing crashes) in Qt 5.5.1 and Qt 5.6.0.
I really think Qt needs to stop pushing such fast development and instead devote some serious time to focusing on getting more stable releases. The number of unresolved bug reports is huge and huge blocks of them have been auto-closed without checking since they were in qt 4.X. So the bug reporter him or herself has to re-open them manually literally years after posting a bug that was never worked on.
I don't think it has been a full 6 months since Qt 5.4.2 was released and they have already moved to Qt 5.5, 5.5.1, 5.6.0 and seem to be leaving a long string of bugs behind them in some strange race to dump older platforms, webkit, older compilers, etc.
I think Sigil sticking to Qt 5.4.2 seems like a very good idea for the forseeable future as the number of new bugs being reported and not fixed is huge.
KevinH
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