Fixes RHS not scrolling to show previews when file attached.
Fixes RHS not scrolling to show previews when file attached.

trashcan/platform,justyns/platform,rahulltkr/platform,gluwaile/platform,cadecairos/mattermoz,xogeny/platform,asaadmahmoodspin/platform,trashcan/platform,apaatsio/platform,michaelkacher/platform,fosstp/platform,tbolon/platform,bartuspan/platform,justyns/platform,cadecairos/mattermoz,ttyniwa/platform,gaev2003/platform,mozilla/mattermoz,TSlean/platform,coraxster/platform,ttyniwa/platform,dotcominternet/platform,gaev2003/platform,StateFarmIns/mattermost,fosstp/platform,andela/mattermost-platform,asaadmahmoodspin/platform,codevlabs/platform,codevlabs/platform,npcode/platform,gaev2003/platform,dotcominternet/platform,gaev2003/platform,andela/mattermost-platform,lawrenae/mattermost,TSlean/platform,HackerHappyHour/platform,michaelkacher/platform,npcode/platform,cyanlime/platform,jmptrader/platform,samogot/platform,jmptrader/platform,bartuspan/platform,xogeny/platform,trashcan/platform,ZBoxApp/platform,npcode/platform,codevlabs/platform,ZBoxApp/platform,cadecairos/mattermoz,kernicPanel/platform,ZBoxApp/platform,rgarmsen2295/platform,fosstp/platform,michaelkacher/platform,bkeroack/platform,TSlean/platform,ttyniwa/platform,florianorben/platform,ttyniwa/platform,gluwaile/platform,HackerHappyHour/platform,dotcominternet/platform,raghavenc5/TabGen,apaatsio/platform,rgarmsen2295/platform,justyns/platform,dimitertodorov/platform,trigrass2/platform,justyns/platform,lawrenae/mattermost,daizenberg/platform,apaatsio/platform,raghavenc5/TabGen,gluwaile/platform,raghavenc5/TabGen,kernicPanel/platform,dimitertodorov/platform,raghavenc5/TabGen,raghavenc5/TabGen,mozilla/mattermoz,samogot/platform,StateFarmIns/mattermost,numericube/platform,mozilla/mattermoz,42wim/platform,StateFarmIns/mattermost,numericube/platform,lawrenae/mattermost,jmptrader/platform,andela/mattermost-platform,ninja-/platform,xogeny/platform,rahulltkr/platform,michaelkacher/platform,asaadmahmoodspin/platform,gluwaile/platform,tbolon/platform,xogeny/platform,xogeny/platform,gluwaile/platform,HackerHappyHour/platform,npcode/platform,HackerHappyHour/platform,ttyniwa/platform,npcode/platform,samogot/platform,mozilla/mattermoz,numericube/platform,ninja-/platform,cadecairos/mattermoz,rompic/platform,florianorben/platform,trigrass2/platform,42wim/platform,andela/mattermost-platform,rahulltkr/platform,tbolon/platform,apaatsio/platform,gaev2003/platform,bartuspan/platform,trashcan/platform,coraxster/platform,rahulltkr/platform,bkeroack/platform,codevlabs/platform,justyns/platform,bartuspan/platform,jmptrader/platform,lawrenae/mattermost,mozilla/mattermoz,daizenberg/platform,ninja-/platform,rgarmsen2295/platform,florianorben/platform,coraxster/platform,bkeroack/platform,ninja-/platform,coraxster/platform,tbalthazar/platform,kernicPanel/platform,trashcan/platform,rompic/platform,trigrass2/platform,42wim/platform,tbalthazar/platform,cyanlime/platform,tbolon/platform,florianorben/platform,bkeroack/platform,TSlean/platform,rgarmsen2295/platform,dotcominternet/platform,bartuspan/platform,daizenberg/platform,kernicPanel/platform,tbolon/platform,jmptrader/platform,cyanlime/platform,HackerHappyHour/platform,fosstp/platform,trigrass2/platform,andela/mattermost-platform,rgarmsen2295/platform,StateFarmIns/mattermost,bkeroack/platform,coraxster/platform,michaelkacher/platform,apaatsio/platform,codevlabs/platform,tbalthazar/platform,kernicPanel/platform,dimitertodorov/platform,rompic/platform,ZBoxApp/platform,trigrass2/platform,ZBoxApp/platform,lawrenae/mattermost,StateFarmIns/mattermost,florianorben/platform,cadecairos/mattermoz,TSlean/platform,ninja-/platform,cyanlime/platform