Test case: tst_printing::printFromPdfViewer has failed 2 times and was flaky 5 times last week.

The test has blocked around 2 Gerrit changes past week

Coin log excerpt from failed run:
agent:2024/08/02 15:52:05 build.go:404: 43: FAIL! : tst_Printing::printFromPdfViewer() 'ok' returned FALSE. ()
agent:2024/08/02 15:52:05 build.go:404: 43: Loc: [/home/qt/work/qt/qtwebengine/tests/auto/widgets/printing/tst_printing.cpp(163)]
agent:2024/08/02 15:52:05 build.go:404: 43: QFATAL : tst_Printing::interruptPrinting() ASSERT: "mapIt != m_printCallbacks.end()" in file /home/qt/work/qt/qtwebengine/src/core/web_contents_adapter.cpp, line 1392
...

Full log at : coin log
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Information about the Qt test system: qt test execution information