how to filter out debug messages like “XI2 mouse release … source MouseEventNotSynthesized”

[Joachim W]

After enabling debug messages, my console is flooded with unwanted system messages like

XI2 mouse motion 331,150, time 188607671, source MouseEventNotSynthesized

How to get rid of them? I guess through

QLoggingCategory::setFilterRules("*.debug=true;foo.bar.debug=false");

How to find out what to put in place of foo.bar?

Disclosure: a longer version of this question is pending at https://stackoverflow.com/questions/48486828

[Joachim W]

Answer at https://stackoverflow.com/a/48491350/1017348.

The documentation of QLoggingCategory has a wrong separator character (https://bugreports.qt.io/browse/QTBUG-66050) and is insufficient (https://bugreports.qt.io/browse/QTBUG-66051).