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MTX crash after moving appended tracks #2009
Here is the forum post.
And here the bug video.
Basically I'm convinced that this is actually a bug inside Qt where internal state is somehow corrupted during drag & drop operations if one or more columns are hidden. I've implemented something of a workaround that seems to fix the internal state.
That being said, I haven't debugged Qt itself, and therefore I don't really understand the nature of the corruption, nor why my workaround seems to work. I'm happy enough to leave the workaround in place as it seems to work on both Linux (Qt 5.8) and Windows (Qt 5.7), but I cannot in good conscience claim that this has really been fixed.
Maybe I'll find some more time to create a small test program and to file a bug against Qt.