Flatten and cleanup `ConstellationListener::is_cancelled`.
Flatten and cleanup `ConstellationListener::is_cancelled`.

saneyuki/servo,nrc/servo,DominoTree/servo,cbrewster/servo,thiagopnts/servo,dsandeephegde/servo,szeged/servo,nnethercote/servo,ConnorGBrewster/servo,paulrouget/servo,paulrouget/servo,avadacatavra/servo,dsandeephegde/servo,mbrubeck/servo,paulrouget/servo,cbrewster/servo,splav/servo,paulrouget/servo,sadmansk/servo,paulrouget/servo,pyfisch/servo,larsbergstrom/servo,canaltinova/servo,nnethercote/servo,SimonSapin/servo,emilio/servo,emilio/servo,upsuper/servo,jimberlage/servo,upsuper/servo,avadacatavra/servo,larsbergstrom/servo,emilio/servo,eddyb/servo,larsbergstrom/servo,SimonSapin/servo,notriddle/servo,peterjoel/servo,szeged/servo,dsandeephegde/servo,SimonSapin/servo,upsuper/servo,larsbergstrom/servo,KiChjang/servo,dati91/servo,larsbergstrom/servo,saneyuki/servo,canaltinova/servo,ConnorGBrewster/servo,peterjoel/servo,notriddle/servo,pyfisch/servo,eddyb/servo,mattnenterprise/servo,emilio/servo,notriddle/servo,nrc/servo,cbrewster/servo,mattnenterprise/servo,anthgur/servo,SimonSapin/servo,szeged/servo,CJ8664/servo,pyfisch/servo,avadacatavra/servo,emilio/servo,KiChjang/servo,fiji-flo/servo,dsandeephegde/servo,cbrewster/servo,notriddle/servo,eddyb/servo,canaltinova/servo,jimberlage/servo,larsbergstrom/servo,upsuper/servo,emilio/servo,sadmansk/servo,eddyb/servo,upsuper/servo,CJ8664/servo,cbrewster/servo,avadacatavra/servo,sadmansk/servo,rnestler/servo,eddyb/servo,dsandeephegde/servo,fiji-flo/servo,peterjoel/servo,ConnorGBrewster/servo,DominoTree/servo,splav/servo,mattnenterprise/servo,KiChjang/servo,ConnorGBrewster/servo,mattnenterprise/servo,mbrubeck/servo,KiChjang/servo,dati91/servo,eddyb/servo,saneyuki/servo,dati91/servo,avadacatavra/servo,upsuper/servo,jimberlage/servo,nrc/servo,pyfisch/servo,pyfisch/servo,emilio/servo,ConnorGBrewster/servo,anthgur/servo,mbrubeck/servo,canaltinova/servo,CJ8664/servo,rnestler/servo,notriddle/servo,paulrouget/servo,saneyuki/servo,emilio/servo,nrc/servo,szeged/servo,rnestler/servo,sadmansk/servo,mbrubeck/servo,larsbergstrom/servo,mattnenterprise/servo,pyfisch/servo,DominoTree/servo,peterjoel/servo,upsuper/servo,nnethercote/servo,SimonSapin/servo,KiChjang/servo,ConnorGBrewster/servo,fiji-flo/servo,mbrubeck/servo,splav/servo,peterjoel/servo,nrc/servo,DominoTree/servo,SimonSapin/servo,nnethercote/servo,mbrubeck/servo,CJ8664/servo,fiji-flo/servo,notriddle/servo,paulrouget/servo,szeged/servo,szeged/servo,thiagopnts/servo,mattnenterprise/servo,nnethercote/servo,notriddle/servo,emilio/servo,dsandeephegde/servo,KiChjang/servo,saneyuki/servo,nrc/servo,nrc/servo,thiagopnts/servo,dati91/servo,jimberlage/servo,CJ8664/servo,KiChjang/servo,cbrewster/servo,mbrubeck/servo,notriddle/servo,sadmansk/servo,saneyuki/servo,splav/servo,KiChjang/servo,SimonSapin/servo,fiji-flo/servo,anthgur/servo,DominoTree/servo,cbrewster/servo,avadacatavra/servo,szeged/servo,splav/servo,canaltinova/servo,notriddle/servo,splav/servo,splav/servo,nnethercote/servo,canaltinova/servo,fiji-flo/servo,thiagopnts/servo,thiagopnts/servo,peterjoel/servo,DominoTree/servo,jimberlage/servo,saneyuki/servo,paulrouget/servo,szeged/servo,splav/servo,paulrouget/servo,rnestler/servo,notriddle/servo,DominoTree/servo,CJ8664/servo,peterjoel/servo,splav/servo,SimonSapin/servo,emilio/servo,avadacatavra/servo,sadmansk/servo,nnethercote/servo,paulrouget/servo,dati91/servo,upsuper/servo,splav/servo,thiagopnts/servo,mbrubeck/servo,anthgur/servo,fiji-flo/servo,sadmansk/servo,peterjoel/servo,jimberlage/servo,eddyb/servo,saneyuki/servo,rnestler/servo,canaltinova/servo,ConnorGBrewster/servo,pyfisch/servo,fiji-flo/servo,larsbergstrom/servo,canaltinova/servo,rnestler/servo,rnestler/servo,peterjoel/servo,anthgur/servo,pyfisch/servo,DominoTree/servo,saneyuki/servo,dati91/servo,mattnenterprise/servo,DominoTree/servo,avadacatavra/servo,rnestler/servo,pyfisch/servo,nnethercote/servo,ConnorGBrewster/servo,cbrewster/servo,larsbergstrom/servo,pyfisch/servo,jimberlage/servo,anthgur/servo,jimberlage/servo,larsbergstrom/servo,eddyb/servo,sadmansk/servo,nnethercote/servo,mattnenterprise/servo,saneyuki/servo,dsandeephegde/servo,DominoTree/servo,dati91/servo,KiChjang/servo,jimberlage/servo,anthgur/servo,CJ8664/servo,peterjoel/servo,anthgur/servo,nnethercote/servo,thiagopnts/servo,szeged/servo,thiagopnts/servo,dati91/servo,szeged/servo,dsandeephegde/servo,CJ8664/servo,KiChjang/servo