Fix problem with copying from text window.
Fix problem with copying from text window.

closes #9843

bwspenc/moose,YaqiWang/moose,yipenggao/moose,Chuban/moose,lindsayad/moose,andrsd/moose,SudiptaBiswas/moose,milljm/moose,idaholab/moose,idaholab/moose,laagesen/moose,bwspenc/moose,milljm/moose,yipenggao/moose,harterj/moose,dschwen/moose,idaholab/moose,SudiptaBiswas/moose,bwspenc/moose,sapitts/moose,jessecarterMOOSE/moose,dschwen/moose,Chuban/moose,yipenggao/moose,sapitts/moose,yipenggao/moose,laagesen/moose,jessecarterMOOSE/moose,lindsayad/moose,friedmud/moose,friedmud/moose,Chuban/moose,jessecarterMOOSE/moose,dschwen/moose,bwspenc/moose,YaqiWang/moose,nuclear-wizard/moose,friedmud/moose,permcody/moose,permcody/moose,harterj/moose,sapitts/moose,SudiptaBiswas/moose,andrsd/moose,lindsayad/moose,andrsd/moose,friedmud/moose,nuclear-wizard/moose,idaholab/moose,milljm/moose,permcody/moose,lindsayad/moose,milljm/moose,andrsd/moose,dschwen/moose,dschwen/moose,lindsayad/moose,idaholab/moose,SudiptaBiswas/moose,jessecarterMOOSE/moose,nuclear-wizard/moose,bwspenc/moose,SudiptaBiswas/moose,sapitts/moose,laagesen/moose,nuclear-wizard/moose,laagesen/moose,laagesen/moose,sapitts/moose,harterj/moose,Chuban/moose,harterj/moose,permcody/moose,YaqiWang/moose,milljm/moose,YaqiWang/moose,andrsd/moose,harterj/moose,jessecarterMOOSE/moose