lib/model: Don't exit pullerRoutine on cancelled ctx (fixes #6559) (#6562)

* lib/model: Don't exit pullerRoutine on cancelled ctx (fixes #6559)

* actual fix

lib/model/folder_sendrecv.go

@@ -1079,30 +1079,12 @@ func (f *sendReceiveFolder) handleFile(file protocol.FileInfo, snap *db.Snapshot
 		"action": "update",
 	})
 
-	s := sharedPullerState{
-		file:             file,
-		fs:               f.fs,
-		folder:           f.folderID,
-		tempName:         tempName,
-		realName:         file.Name,
-		copyTotal:        len(blocks),
-		copyNeeded:       len(blocks),
-		reused:           len(reused),
-		updated:          time.Now(),
-		available:        reused,
-		availableUpdated: time.Now(),
-		ignorePerms:      f.IgnorePerms || file.NoPermissions,
-		hasCurFile:       hasCurFile,
-		curFile:          curFile,
-		mut:              sync.NewRWMutex(),
-		sparse:           !f.DisableSparseFiles,
-		created:          time.Now(),
-	}
+	s := newSharedPullerState(file, f.fs, f.folderID, tempName, blocks, reused, f.IgnorePerms || file.NoPermissions, hasCurFile, curFile, !f.DisableSparseFiles)
 
 	l.Debugf("%v need file %s; copy %d, reused %v", f, file.Name, len(blocks), len(reused))
 
 	cs := copyBlocksState{
-		sharedPullerState: &s,
+		sharedPullerState: s,
 		blocks:            blocks,
 		have:              len(have),
 	}
@@ -1384,7 +1366,9 @@ func (f *sendReceiveFolder) pullerRoutine(in <-chan pullBlockState, out chan<- *
 		bytes := int(state.block.Size)
 
 		if err := requestLimiter.takeWithContext(f.ctx, bytes); err != nil {
-			break
+			state.fail(err)
+			out <- state.sharedPullerState
+			continue
 		}
 
 		wg.Add(1)