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Not exactly sure what is causing this, but after upgrading to 0.7.5 our test output has become quite a bit noisier. QT is logging the following message multiple times during our test runs:
QPainter: Painter ended with 2 saved states
Just noting that I haven't seen this myself. Are you using a custom build of wkhtmltopdf? I usually just use the downloadable binary with QT support compiled in.
We're using QT from Homebrew - so maybe this is more of a QT issue? We're seeing it with 4.7.3 and 4.8.0 from Homebrew. Could also be a wkhtmltopdf thing.
I'll try to whip together a minimal test case to reproduce.