I tried with "nativedialogs=true" in
~/.config/MuseScore/MuseScoreDevelopment.ini but there wasn't any change
(i.e. still crashing).
Then I noticed that at the beginning of the command line output there was
this warning: "QApplication: invalid style override passed, ignoring it",
which led me to this conversation:
https://forum.qt.io/topic/75398/qt-5-8-0-qapplication-invalid-style-override-passed-ignoring-it
I thus decided to move libqtgtk3.so away from its location in
Qt/5.8/gcc_64/plugins/platformthemes (renaming was not enough) and start
mscore again with "-F". The crash disappeared. When copying back
libqtgtk3.so in the platformthemes folder, the crash appeared again.
Therefore I guess the problem probably lies inside Qt's gtk3 platform plugin
implementation.

(As a side note, after a factory reset "-F" the "nativedialogs" line
disappeared in the new MuseScoreDevelopment.ini file)



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