Fix bug caused by recent Opera versions supporting cut/copy events
Fix bug caused by recent Opera versions supporting cut/copy events

The code assumed being on opera meant those events would never fire.

Closes #952

kevinushey/CodeMirror,grzegorzmazur/CodeMirror,jansel/CodeMirror,isdampe/CodeMirror,elisee/CodeMirror,NumbersInternational/CodeMirror,explorigin/CodeMirror,mightyguava/CodeMirror,pinbe/CodeMirror,matthewbauer/CodeMirror,shiren/CodeMirror,Icenium/CodeMirror,notepadqq/CodeMirror,Navaneethsen/CodeMirror,nightwing/CodeMirror,cintiamh/CodeMirror,gkoberger/CodeMirror,kangkot/CodeMirror,wingify/CodeMirror,bluesh55/CodeMirror,ashmind/CodeMirror,sanyaade-iot/CodeMirror,jayaprabhakar/CodeMirror,namin/CodeMirror,dbarnett/CodeMirror,EasonYi/CodeMirror,d0liver/CodeMirror,crazy4chrissi/CodeMirror,ejgallego/CodeMirror,melpon/CodeMirror,webida/CodeMirror,matthewbauer/CodeMirror,namin/CodeMirror,bfrohs/CodeMirror,philuchansky/CodeMirror,buchslava/CodeMirror,xeronith/CodeMirror,amshali/CodeMirror,dbarnett/CodeMirror,jkaplon/CodeMirror,supriyantomaftuh/CodeMirror,jansel/CodeMirror,kangkot/CodeMirror,schanzer/CodeMirror,nightwing/CodeMirror,dperetti/CodeMirror,shiren/CodeMirror,morrisonwudi/CodeMirror,Allenice/CodeMirror,supriyantomaftuh/CodeMirror,rustemferreira/CodeMirror,jochenberger/CodeMirror,Jisuanke/CodeMirror,explorigin/CodeMirror,systay/CodeMirror,michaelerobertsjr/CodeMirror,r7kamura/CodeMirror,dudb/CodeMirror,djadmin/CodeMirror,increpare/CodeMirror,mtaran-google/CodeMirror,matthewbauer/CodeMirror,jpolitz/CodeMirror,sourcelair/CodeMirror,wingify/CodeMirror,MarcelGerber/CodeMirror,Ermlab/CodeMirror,camellhf/CodeMirror,sekcheong/CodeMirror,KamranMackey/CodeMirror,sgoo/CodeMirror,Aliccer/CodeMirror,agendor/CodeMirror,abdelouahabb/CodeMirror,jessegrosjean/CodeMirror,GerHobbelt/CodeMirror2,mizchi/CodeMirror,namin/CodeMirror,ejgallego/CodeMirror,trumanliu/CodeMirror,dperetti/CodeMirror,INTELOGIE/CodeMirror,loopspace/CodeMirror,loopspace/CodeMirror,Jisuanke/CodeMirror,sanyaade-iot/CodeMirror,TDaglis/CodeMirror,increpare/CodeMirror,camellhf/CodeMirror,grzegorzmazur/CodeMirror,bocharsky-bw/CodeMirror,NumbersInternational/CodeMirror,rasata/CodeMirror,djadmin/CodeMirror,mihailik/CodeMirror,amsul/CodeMirror,fivetran/CodeMirror,happibum/CodeMirror-main,Aliccer/CodeMirror,Carreau/CodeMirror,qweasd1/CodeMirror,r7kamura/CodeMirror,DustinH/CodeMirror,nawroth/CodeMirror,cben/CodeMirror,trumanliu/CodeMirror,ZombieHippie/CodeMirror,NeZaMy/CodeMirror2,camellhf/CodeMirror,hackmdio/CodeMirror,pinbe/CodeMirror,antimatter15/CodeMirror,jessegrosjean/CodeMirror,rrandom/CodeMirror,apatawari/CodeMirror,kerabromsmu/CodeMirror,fmoliveira/CodeMirror,kuangyeheng/CodeMirror,Ermlab/CodeMirror,dperetti/CodeMirror,wingify/CodeMirror,manderson23/CodeMirror,wbinnssmith/CodeMirror,Icenium/CodeMirror,happibum/CodeMirror-main,kuangyeheng/CodeMirror,loopspace/CodeMirror,crazy4chrissi/CodeMirror,CartoDB/CodeMirror,rasata/CodeMirror,cben/CodeMirror,karthikeyansam/CodeMirror,adobe/CodeMirror2,ssxxue/CodeMirror,vanloswang/CodeMirror,MarcelGerber/CodeMirror,qiankun007/CodeMirror,ThebingServices/CodeMirror,Allenice/CodeMirror,wbinnssmith/CodeMirror,manderson23/CodeMirror,KamranMackey/CodeMirror,qiankun007/CodeMirror,xeronith/CodeMirror,amshali/CodeMirror,notepadqq/CodeMirror,elisee/CodeMirror,mtaran-google/CodeMirror,Dominator008/CodeMirror,michaelerobertsjr/CodeMirror,bfrohs/CodeMirror,karthikeyansam/CodeMirror,morrisonwudi/CodeMirror,pabloferz/CodeMirror,NeZaMy/CodeMirror2,vanloswang/CodeMirror,pjkui/CodeMirror,vincentwoo/CodeMirror,mightyguava/CodeMirror,Dominator008/CodeMirror,hccampos/CodeMirror,SidPresse/CodeMirror,vincentwoo/CodeMirror,melpon/CodeMirror,kerabromsmu/CodeMirror,Carreau/CodeMirror,thomasjm/CodeMirror,Aliccer/CodeMirror,fmoliveira/CodeMirror,Dominator008/CodeMirror,kolya-ay/CodeMirror,SidPresse/CodeMirror,morrisonwudi/CodeMirror,TechnicalPursuit/CodeMirror,ssxxue/CodeMirror,hackmdio/CodeMirror,kangkot/CodeMirror,tpphu/CodeMirror,joshterrell805-historic/CodeMirror,ashmind/CodeMirror,ksanaforge/CodeMirror,fpco/codemirror,fmoliveira/CodeMirror,davidpham87/CodeMirror,belph/CodeMirror,d0liver/CodeMirror,jkaplon/CodeMirror,codio/CodeMirror,vanloswang/CodeMirror,dudb/CodeMirror,amshali/CodeMirror,qweasd1/CodeMirror,antimatter15/CodeMirror,Allenice/CodeMirror,bgrins/CodeMirror,DustinH/CodeMirror,pabloferz/CodeMirror,mightyguava/CodeMirror,belph/CodeMirror,kolya-ay/CodeMirror,isdampe/CodeMirror,InternetGuru/CodeMirror,Navaneethsen/CodeMirror,kk9599/CodeMirror,davidpham87/CodeMirror,alur/CodeMirror,ZombieHippie/CodeMirror,davidpham87/CodeMirror,xeronith/CodeMirror,cintiamh/CodeMirror,bgrins/CodeMirror,webida/CodeMirror,hackmdio/CodeMirror,GerHobbelt/CodeMirror2,mtaran-google/CodeMirror,apatawari/CodeMirror,fivetran/CodeMirror,bfrohs/CodeMirror,EasonYi/CodeMirror,kk9599/CodeMirror,NeZaMy/CodeMirror2,grzegorzmazur/CodeMirror,pjkui/CodeMirror,increpare/CodeMirror,jessegrosjean/CodeMirror,hccampos/CodeMirror,tpphu/CodeMirror,adobe/CodeMirror2,sanyaade-iot/CodeMirror,schanzer/CodeMirror,tpphu/CodeMirror,webida/CodeMirror,agendor/CodeMirror,amsul/CodeMirror,EasonYi/CodeMirror,ZombieHippie/CodeMirror,Icenium/CodeMirror,gkoberger/CodeMirror,trumanliu/CodeMirror,a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