With last tip on develop the number passed to my showYesNoCancelBox’s callback has changed (on Linux / Ubuntu 20.04).
It works fine with 7.0.5 (master) by the way.
I need to investigate more ; in my App i override LookAndFeel::createAlertWindow and thus i need to spend few hours to fetch what’s going on. 
Sorry about that, I think I see where the bug is coming from. Should hopefully get that fixed next week.
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Thanks. So I’ll wait before to investigate. 
Sorry for the delay. This bug should be fixed here:
Please try updating, and let me know if you’re still seeing unexpected behaviour.
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At first view it works fine now. Thanks. 