Use a temporary file for large reports to avoid QWebEngine limit
QWebEngine::load is limited to 2MB, which when encoded and otherwise processed, seems to be as low as 1,200,000 "characters" in a QString. For large file, write to a temporary file before loading. This does not take care of any relative links in the HTML, which will need further work. BUG: 461391 FIXED-IN: 3.4.5
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