all: Clean up dead code

GitHub-Pull-Request: https://github.com/syncthing/syncthing/pull/3005

lib/model/devicedownloadstate.go

@@ -90,9 +90,8 @@ func (p *deviceFolderDownloadState) NumberOfBlocksInProgress() int {
 // deviceDownloadState represents the state of all in progress downloads
 // for all folders of a specific device.
 type deviceDownloadState struct {
-	mut                      sync.RWMutex
-	folders                  map[string]*deviceFolderDownloadState
-	numberOfBlocksInProgress int
+	mut     sync.RWMutex
+	folders map[string]*deviceFolderDownloadState
 }
 
 // Update updates internal state of what has been downloaded into the temporary

lib/model/progressemitter.go

@@ -21,7 +21,6 @@ type ProgressEmitter struct {
 	registry           map[string]*sharedPullerState
 	interval           time.Duration
 	minBlocks          int
-	lastUpdate         time.Time
 	sentDownloadStates map[protocol.DeviceID]*sentDownloadState // States representing what we've sent to the other peer via DownloadProgress messages.
 	connections        map[string][]protocol.Connection
 	mut                sync.Mutex

lib/model/rwfolder.go

@@ -1492,16 +1492,6 @@ func (p *rwFolder) inConflict(current, replacement protocol.Vector) bool {
 	return false
 }
 
-func invalidateFolder(cfg *config.Configuration, folderID string, err error) {
-	for i := range cfg.Folders {
-		folder := &cfg.Folders[i]
-		if folder.ID == folderID {
-			folder.Invalid = err.Error()
-			return
-		}
-	}
-}
-
 func removeAvailability(availabilities []Availability, availability Availability) []Availability {
 	for i := range availabilities {
 		if availabilities[i] == availability {