Use a `synchronized/1` directive for the `debugger` invocation number predicates
Use a `synchronized/1` directive for the `debugger` invocation number predicates

LogtalkDotOrg/logtalk3,LogtalkDotOrg/logtalk3,LogtalkDotOrg/logtalk3,LogtalkDotOrg/logtalk3,LogtalkDotOrg/logtalk3,LogtalkDotOrg/logtalk3,LogtalkDotOrg/logtalk3