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Comment # 10 on bug 12040 from Guy Harris

And, in fact, the code around line 265 of ui/qt/print_dialog.cpp is

    // cf_print_packets updates the progress bar which in turn calls
    // WiresharkApplication::processEvents(), which can make the preview trip
    // over itself.
    preview_->setUpdatesEnabled(false);
    cf_print_packets(cap_file_, &print_args_);
    preview_->setUpdatesEnabled(true);

so there appears to be an attempt to avoid updating the preview in an inner
event loop - but it appears to be an unsuccessful attempt.

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