all: Add invalid/ignored files to global list, announce to peers (fixes #623)

This lets us determine accurate completion status for remote peers when they
have ignored files.

GitHub-Pull-Request: https://github.com/syncthing/syncthing/pull/4460

lib/config/config.go

@@ -32,7 +32,7 @@ import (
 
 const (
 	OldestHandledVersion = 10
-	CurrentVersion       = 25
+	CurrentVersion       = 26
 	MaxRescanIntervalS   = 365 * 24 * 60 * 60
 )
 
@@ -329,6 +329,9 @@ func (cfg *Configuration) clean() error {
 	if cfg.Version == 24 {
 		convertV24V25(cfg)
 	}
+	if cfg.Version == 25 {
+		convertV25V26(cfg)
+	}
 
 	// Build a list of available devices
 	existingDevices := make(map[protocol.DeviceID]bool)
@@ -378,6 +381,11 @@ func (cfg *Configuration) clean() error {
 	return nil
 }
 
+func convertV25V26(cfg *Configuration) {
+	// triggers database update
+	cfg.Version = 26
+}
+
 func convertV24V25(cfg *Configuration) {
 	for i := range cfg.Folders {
 		cfg.Folders[i].FSWatcherDelayS = 10