Opening VM settings window for a running VM locks manager window until settings window is closed

[daviunic]

Clicking the Configure option for a running VM opens the settings window for that VM, but it also locks the manager window until the settings window of the VM is closed. Does not happen if VM is stopped (and thus only the settings window opens).

Cause unknown, possibly related to SendMessage win32 API call.

[daviunic]

Fixed in 1.0.4 by replacing SendMessage call with PostMessage, so the Manager no longer has to wait for 86Box to process the window message.