log window overflow may cause lockup?

[3Dickulus]

while running in GDB, during what appeared to be a random lockup.

(gdb) finish
Run till exit from #0 0x00007ffff65c19bc in ?? () from /usr/lib64/libQt5Widgets.so.5
0x00007ffff65c2608 in QListWidget::setItemWidget(QListWidgetItem*, QWidget*) () from /usr/lib64/libQt5Widgets.so.5

the log window is the only thing that uses QListWidget, I think there is an overflow when the list gets too big, I plan to implement logging to a file and showing the tail of this file in the log window rather than creating widgets for each message.