Only cancel historyWaiter timer on new searches.
Only cancel historyWaiter timer on new searches.

Infinite scroll shouldn't cancel a history push for the results being displayed
by infinite scroll!

Also respond to PR comment.

pelmers/dxr,kleintom/dxr,jay-z007/dxr,pombredanne/dxr,kleintom/dxr,pombredanne/dxr,pelmers/dxr,jay-z007/dxr,pombredanne/dxr,kleintom/dxr,pombredanne/dxr,jbradberry/dxr,jay-z007/dxr,jbradberry/dxr,jbradberry/dxr,pombredanne/dxr,pelmers/dxr,jbradberry/dxr,pelmers/dxr,pelmers/dxr,jbradberry/dxr,jay-z007/dxr,jay-z007/dxr,jay-z007/dxr,kleintom/dxr,jbradberry/dxr,kleintom/dxr,pombredanne/dxr,pombredanne/dxr,jbradberry/dxr,kleintom/dxr,pelmers/dxr,jay-z007/dxr,kleintom/dxr,pelmers/dxr