Make setGutterMarker work on the CodeMirror-linenumbers gutter
Make setGutterMarker work on the CodeMirror-linenumbers gutter

Closes #926

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