lib/model, lib/config: Apply sensible defaults for auto-accepted encr…

…ypted folder (fixes #8296) (#8427)

* lib/model: Override scan config for auto-accepted encrypted folders.

Encrypted folders should not have the fs watcher enabled and rarely
benefit from a scheduled rescan.  The GUI adjusts the suggested
settings (watcher disabled, one day rescan interval) when accepting a
receive-encrypted folder.  Mirror that behavior to the auto-accept
case where the GUI is not involved.

Versioning also does not work well for encrypted folders, same
treatment.

lib/model/model.go

@@ -1675,6 +1675,11 @@ func (m *model) handleAutoAccepts(deviceID protocol.DeviceID, folder protocol.Fo
 
 			if len(ccDeviceInfos.remote.EncryptionPasswordToken) > 0 || len(ccDeviceInfos.local.EncryptionPasswordToken) > 0 {
 				fcfg.Type = config.FolderTypeReceiveEncrypted
+				// Override the user-configured defaults, as normally done by the GUI
+				fcfg.FSWatcherEnabled = false
+				fcfg.RescanIntervalS = 3600 * 24
+				fcfg.Versioning.Reset()
+				// Other necessary settings are ensured by FolderConfiguration itself
 			} else {
 				ignores := m.cfg.DefaultIgnores()
 				if err := m.setIgnores(fcfg, ignores.Lines); err != nil {