Fix bug in undo event combiner
Fix bug in undo event combiner

Closes #348

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