Don't generate the search string on thousands of hidden calls.
Don't generate the search string on thousands of hidden calls.

ApiTraceCall::filterText genrates a string composed of the name plus
all the arguments to use when searching, but thousands of calls are
hidden by our default filter model which means that we were generating
megs of strings data without ever using them. the patch fixes that

schulmar/apitrace,joshua5201/apitrace,surround-io/apitrace,surround-io/apitrace,apitrace/apitrace,trtt/apitrace,schulmar/apitrace,schulmar/apitrace,PeterLValve/apitrace,swq0553/apitrace,apitrace/apitrace,schulmar/apitrace,trtt/apitrace,joshua5201/apitrace,swq0553/apitrace,tuanthng/apitrace,surround-io/apitrace,tuanthng/apitrace,joshua5201/apitrace,swq0553/apitrace,tuanthng/apitrace,tuanthng/apitrace,trtt/apitrace,joshua5201/apitrace,apitrace/apitrace,trtt/apitrace,PeterLValve/apitrace,EoD/apitrace,PeterLValve/apitrace,tuanthng/apitrace,EoD/apitrace,surround-io/apitrace,swq0553/apitrace,surround-io/apitrace,EoD/apitrace,PeterLValve/apitrace,EoD/apitrace,EoD/apitrace,trtt/apitrace,apitrace/apitrace,schulmar/apitrace,joshua5201/apitrace,swq0553/apitrace