Add hidden preference to suppress syncing on launch. Fixes #894

Mac/AppDefaults.swift

@@ -44,6 +44,7 @@ final class AppDefaults {
 		static let timelineShowsSeparators = "CorreiaSeparators"
 		static let showTitleOnMainWindow = "KafasisTitleMode"
 		static let feedDoubleClickMarkAsRead = "GruberFeedDoubleClickMarkAsRead"
+		static let suppressSyncOnLaunch = "DevroeSuppressSyncOnLaunch"
 
 		#if !MAC_APP_STORE
 			static let webInspectorEnabled = "WebInspectorEnabled"
@@ -203,6 +204,15 @@ final class AppDefaults {
 		}
 	}
 
+	var suppressSyncOnLaunch: Bool {
+		get {
+			return AppDefaults.bool(for: Key.suppressSyncOnLaunch)
+		}
+		set {
+			AppDefaults.setBool(for: Key.suppressSyncOnLaunch, newValue)
+		}
+	}
+
 	#if !MAC_APP_STORE
 		var webInspectorEnabled: Bool {
 			get {

Mac/AppDelegate.swift

@@ -251,9 +251,14 @@ class AppDelegate: NSObject, NSApplicationDelegate, NSUserInterfaceValidations,
 		refreshTimer!.update()
 		syncTimer!.update()
 		#else
-		DispatchQueue.main.async {
+		if AppDefaults.shared.suppressSyncOnLaunch {
-			self.refreshTimer!.timedRefresh(nil)
+			refreshTimer!.update()
-			self.syncTimer!.timedRefresh(nil)
+			syncTimer!.update()
+		} else {
+			DispatchQueue.main.async {
+				self.refreshTimer!.timedRefresh(nil)
+				self.syncTimer!.timedRefresh(nil)
+			}
 		}
 		#endif