Split -synchronizeLastEventId in two methods.

The first method (updateUserDefaultsWithLastEventId) just
sets the default while the other (synchronizeUserDefaultsWithDisk)
forces a synchronization with the disk.

Tools/XcodeCapp/FSEventCallback.m

@@ -139,5 +139,5 @@ void fsevents_callback(ConstFSEventStreamRef streamRef,
         }
     }
 
-    [xcc synchronizeLastEventId];
+    [xcc updateUserDefaultsWithLastEventId];
 }

Tools/XcodeCapp/TNXCodeCapp.h

@@ -80,7 +80,8 @@ extern NSString * const XCCListeningStartNotification;
 - (void)initializeEventStreamWithPath:(NSString*)aPath;
 - (void)stopEventStream;
 - (void)updateLastEventId:(uint64_t)eventId;
-- (void)synchronizeLastEventId;
+- (void)updateUserDefaultsWithLastEventId;
+- (void)synchronizeUserDefaultsWithDisk;
 - (void)listenProjectAtPath:(NSString *)path;
 - (void)clear;
 - (void)start;

Tools/XcodeCapp/TNXCodeCapp.m

@@ -195,7 +195,8 @@ NSString * const XCCListeningStartNotification = @"XCCListeningStartNotification
  */
 - (void)clear
 {
-    [self synchronizeLastEventId];
+    [self updateUserDefaultsWithLastEventId];
+    [self synchronizeUserDefaultsWithDisk];
     currentProjectURL = nil;
     currentProjectName = nil;
     [ignoredFilePaths removeAllObjects];
@@ -254,17 +255,24 @@ NSString * const XCCListeningStartNotification = @"XCCListeningStartNotification
 }
 
 /*!
- Synchronizes the last recorded event ID with the user defaults.
+ Updates the user defaults with the last recorded event Id.
  */
-- (void)synchronizeLastEventId {
+- (void)updateUserDefaultsWithLastEventId
+{
     if (lastEventId && [lastEventId longLongValue] != 0)
     {
-        NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
-        [defaults setObject:lastEventId forKey:@"lastEventId"];
-        [defaults synchronize];
+        [[NSUserDefaults standardUserDefaults] setObject:lastEventId forKey:@"lastEventId"];
     }
 }
 
+/*!
+ Tells the standard user defaults to synchronize with disk.
+ */
+- (void)synchronizeUserDefaultsWithDisk
+{
+    [[NSUserDefaults standardUserDefaults] synchronize];
+}
+
 /*!
  Run a NSTask with the given arguments
  @param arguments NSArray containing the NSTask arguments