"Log file" menu option does not save file on Mac OS Mojave 10.14

[askaliuk]

Steps to reproduce:

• start it on Mac OS Mojave 10.14
• make violetbug contain long log
• right click, select "Log file" and save the file
• file does not contain log, just "Logging started" line

Expected result:

• file to contain actual log

Confirmed on 2 separated Macbooks.

[CodellaDeville]

Same issue occurs for me on Window 10 - 64 bit.