Multiclient keystroke are sending to all clients.

Returning player here but this bug still persists ever since I first started multiclient on maplesaga which is like maybe 2 years ago ?

Anyone have a fix for this ? It just come and go

 

Just tab between the clients

 

I noticed it's the alt-tab that triggered the keystroke sent to all clients.
Manually clicking a window to set it active does not reproduce the issue.

 

It happens when you open a new client. Just tab through the clients and you'll be fine