Top flaky test: tst_Printing::printFromPdfViewer

Test case: tst_Printing::printFromPdfViewer has failed 6 times, crashed 0 and was flaky 50 times last week.

The test has blocked around 6 Gerrit changes past week

Coin log excerpt from failed run:
agent:2025/01/06 01:33:11 build.go:404: FAIL! : tst_Printing::printFromPdfViewer() 'ok' returned FALSE. ()
agent:2025/01/06 01:33:11 build.go:404: Loc: [/Users/qt/work/qt/qtwebengine/tests/auto/widgets/printing/tst_printing.cpp(186)]
agent:2025/01/06 01:33:11 build.go:404: [2773:48899:0106/013138.098055:ERROR:external_begin_frame_source_mac.cc(65)] DisplayLinkMac ID is not available. Switch to DelayBasedTimeSource(Timer) for BeginFrameSource.
...

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