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Okay I took a peek at the gumbo-query code and it silently threw strings (not exceptions) all throughout CParser that causes a sigabort not an actual sigsegfault.
So all of those unknown pseudo classes like ":lang(it)" (which BTW should/could have been converted to a simple attribute and value query) now result in throwing exceptions which are caught in CSelection find routine and a qDebug() message is printed and the result of the find is a CSelection with no valid GumboNode*
With these changes using our now more heavily modified Query should be a bit more robust.
I have pushed these changes to Sigil my own github site.
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