[sass mode] Support double-colon pseudo elements
[sass mode] Support double-colon pseudo elements

Closes #1461

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