fix an auto-complete bug for mentions
fix an auto-complete bug for mentions

raghavenc5/TabGen,TSlean/platform,TSlean/platform,StateFarmIns/mattermost,ttyniwa/platform,trashcan/platform,HackerHappyHour/platform,killix/platform,justyns/platform,cagomezt/platform,wavelets/platform,michaelkacher/platform,IQ2022/platform,andela/mattermost-platform,stralsi/platform,FabianFrancoRoldan/platform,ttyniwa/platform,FabianFrancoRoldan/platform,codevlabs/platform,codevlabs/platform,florianorben/platform,justyns/platform,saitodisse/platform,baiwyc119/platform,cagomezt/platform,lawrenae/mattermost,sharp/platform,jdeng/platform,cadecairos/mattermoz,bartuspan/platform,apaatsio/platform,dimitertodorov/platform,bkeroack/platform,cadecairos/mattermoz,michaelkacher/platform,ljshj/platform,gluwaile/platform,asaadmahmoodspin/platform,davidkuhta/platform,yaoyasong/platform,michaelkacher/platform,lawrenae/mattermost,jmptrader/platform,justyns/platform,yaoyasong/platform,rahulltkr/platform,hungle90/platform,dotcominternet/platform,pokemonmegaman/platform,npcode/platform,jmptrader/platform,cyanlime/platform,jdeng/platform,rompic/platform,hustlzp/platform,baiwyc119/platform,bartuspan/platform,killix/platform,oblank/platform,ZBoxApp/platform,folpindo/platform,kitgary/platform,Huangyan9188/platform,justyns/platform,FabianFrancoRoldan/platform,StateFarmIns/mattermost,codevlabs/platform,apaatsio/platform,sharp/platform,LAndreas/platform,daizenberg/platform,narita-takeru/platform,wavelets/platform,kernicPanel/platform,ninja-/platform,StateFarmIns/mattermost,nota-ja/platform,gluwaile/platform,killix/platform,npcode/platform,LawrenceHan/platform,no2key/platform,jmptrader/platform,hustlzp/platform,42wim/platform,saitodisse/platform,folpindo/platform,ttyniwa/platform,tbalthazar/platform,kitgary/platform,coraxster/platform,fosstp/platform,TSlean/platform,driou/platform,dotcominternet/platform,sharp/platform,stralsi/platform,trigrass2/platform,FabianFrancoRoldan/platform,kernicPanel/platform,lawrenae/mattermost,Huangyan9188/platform,xogeny/platform,no2key/platform,coraxster/platform,florianorben/platform,TSlean/platform,nota-ja/platform,HackerHappyHour/platform,justyns/platform,michaelkacher/platform,cadecairos/mattermoz,numericube/platform,andela/mattermost-platform,cadecairos/mattermoz,codevlabs/platform,HackerHappyHour/platform,coraxster/platform,yaoyasong/platform,fosstp/platform,apaatsio/platform,LawrenceHan/platform,pokemonmegaman/platform,kernicPanel/platform,bkeroack/platform,narita-takeru/platform,hustlzp/platform,apaatsio/platform,rahulltkr/platform,raghavenc5/TabGen,trigrass2/platform,tbolon/platform,kitgary/platform,LawrenceHan/platform,samogot/platform,xogeny/platform,gluwaile/platform,andela/mattermost-platform,saitodisse/platform,mozilla/mattermoz,davidkuhta/platform,andela/mattermost-platform,sharp/platform,harryross/platform,baiwyc119/platform,pokemonmegaman/platform,stralsi/platform,raghavenc5/TabGen,ZBoxApp/platform,yaoyasong/platform,StateFarmIns/mattermost,lawrenae/mattermost,narita-takeru/platform,dotcominternet/platform,coraxster/platform,tbalthazar/platform,asaadmahmoodspin/platform,dimitertodorov/platform,gaev2003/platform,samogot/platform,gluwaile/platform,sjmog/platform,trashcan/platform,dotcominternet/platform,trigrass2/platform,ljshj/platform,bkeroack/platform,LAndreas/platform,baiwyc119/platform,rompic/platform,lawrenae/mattermost,saitodisse/platform,ZBoxApp/platform,stralsi/platform,ZBoxApp/platform,florianorben/platform,hungle90/platform,trashcan/platform,rgarmsen2295/platform,HackerHappyHour/platform,davidkuhta/platform,ninja-/platform,sharp/platform,rgarmsen2295/platform,hustlzp/platform,rahulltkr/platform,cadecairos/mattermoz,driou/platform,kernicPanel/platform,rompic/platform,harryross/platform,raghavenc5/TabGen,42wim/platform,folpindo/platform,rgarmsen2295/platform,tbolon/platform,ttyniwa/platform,mozilla/mattermoz,StateFarmIns/mattermost,bartuspan/platform,gluwaile/platform,harryross/platform,FabianFrancoRoldan/platform,harryross/platform,daizenberg/platform,LawrenceHan/platform,jmptrader/platform,driou/platform,cagomezt/platform,folpindo/platform,coraxster/platform,bkeroack/platform,xogeny/platform,trigrass2/platform,mozilla/mattermoz,Huangyan9188/platform,LAndreas/platform,IQ2022/platform,gaev2003/platform,jdeng/platform,asaadmahmoodspin/platform,folpindo/platform,hungle90/platform,ttyniwa/platform,numericube/platform,narita-takeru/platform,rahulltkr/platform,nota-ja/platform,ninja-/platform,fosstp/platform,saitodisse/platform,fosstp/platform,bkeroack/platform,npcode/platform,gaev2003/platform,wavelets/platform,stralsi/platform,npcode/platform,harryross/platform,florianorben/platform,ljshj/platform,kitgary/platform,hungle90/platform,bartuspan/platform,kitgary/platform,LawrenceHan/platform,xogeny/platform,no2key/platform,samogot/platform,gaev2003/platform,hungle90/platform,tbolon/platform,pokemonmegaman/platform,raghavenc5/TabGen,jdeng/platform,IQ2022/platform,apaatsio/platform,bartuspan/platform,cagomezt/platform,cagomezt/platform,nota-ja/platform,42wim/platform,ljshj/platform,driou/platform,trigrass2/platform,sjmog/platform,wavelets/platform,trashcan/platform,killix/platform,pokemonmegaman/platform,xogeny/platform,kernicPanel/platform,rgarmsen2295/platform,ninja-/platform,LAndreas/platform,wavelets/platform,no2key/platform,no2key/platform,yaoyasong/platform,cyanlime/platform,sjmog/platform,davidkuhta/platform,florianorben/platform,ninja-/platform,baiwyc119/platform,mozilla/mattermoz,nota-ja/platform,numericube/platform,tbolon/platform,daizenberg/platform,ljshj/platform,jmptrader/platform,npcode/platform,sjmog/platform,andela/mattermost-platform,driou/platform,cyanlime/platform,rgarmsen2295/platform,TSlean/platform,sjmog/platform,jdeng/platform,mozilla/mattermoz,Huangyan9188/platform,codevlabs/platform,tbalthazar/platform,gaev2003/platform,killix/platform,trashcan/platform,IQ2022/platform,tbolon/platform,HackerHappyHour/platform,oblank/platform,IQ2022/platform,hustlzp/platform,dimitertodorov/platform,michaelkacher/platform,LAndreas/platform,cyanlime/platform,narita-takeru/platform,ZBoxApp/platform,oblank/platform,Huangyan9188/platform,oblank/platform,oblank/platform,davidkuhta/platform