Request background task before disconnecting

This makes sure we get it even when killed by some watchdog while
disconnecting/shutting down

Author: tmolitor-stud-tu

Monal/Classes/MonalAppDelegate.m

@@ -1412,8 +1412,8 @@ -(void) checkIfBackgroundTaskIsStillNeeded
                 [DDLog flushLog];
                 DDLogVerbose(@"Setting _shutdownPending to YES...");
                 _shutdownPending = YES;
-                [[MLXMPPManager sharedInstance] disconnectAll];     //disconnect all accounts to prevent TCP buffer leaking
                 [HelperTools scheduleBackgroundTask:NO];            //request bg fetch execution in BGFETCH_DEFAULT_INTERVAL seconds
+                [[MLXMPPManager sharedInstance] disconnectAll];     //disconnect all accounts to prevent TCP buffer leaking
                 [HelperTools dispatchAsync:NO reentrantOnQueue:dispatch_get_main_queue() withBlock:^{
                     BOOL stopped = NO;
                     //make sure this will be done only once, even if we have an uikit bgtask and a bg fetch running simultaneously
@@ -1490,13 +1490,13 @@ -(void) addBackgroundTask
                         //this has to be before account disconnects, to detect which accounts are not idle (e.g. have a sync error)
                         [HelperTools updateSyncErrorsWithDeleteOnly:NO andWaitForCompletion:YES];
 
-                        //disconnect all accounts to prevent TCP buffer leaking
-                        [[MLXMPPManager sharedInstance] disconnectAll];
-                        
                         //schedule a BGProcessingTaskRequest to process this further as soon as possible
                         //(if we end up here, the graceful shuttdown did not work out because we are not idle --> we need more cpu time)
                         [HelperTools scheduleBackgroundTask:YES];      //force as soon as possible
 
+                        //disconnect all accounts to prevent TCP buffer leaking
+                        [[MLXMPPManager sharedInstance] disconnectAll];
+                        
                         //notify about pending app freeze (don't queue this notification because it should be handled IMMEDIATELY and INLINE)
                         DDLogVerbose(@"Posting kMonalWillBeFreezed notification now...");
                         [[NSNotificationCenter defaultCenter] postNotificationName:kMonalWillBeFreezed object:nil];
@@ -1549,13 +1549,13 @@ -(void) handleBackgroundProcessingTask:(BGTask*) task
                     //this has to be before account disconnects, to detect which accounts are not idle (e.g. have a sync error)
                     [HelperTools updateSyncErrorsWithDeleteOnly:YES andWaitForCompletion:YES];
 
-                    //disconnect all accounts to prevent TCP buffer leaking
-                    [[MLXMPPManager sharedInstance] disconnectAll];
-                    
                     //schedule a new BGProcessingTaskRequest to process this further as soon as possible
                     //(if we end up here, the graceful shuttdown did not work out because we are not idle --> we need more cpu time)
                     [HelperTools scheduleBackgroundTask:YES];      //force as soon as possible
 
+                    //disconnect all accounts to prevent TCP buffer leaking
+                    [[MLXMPPManager sharedInstance] disconnectAll];
+                    
                     //notify about pending app freeze (don't queue this notification because it should be handled IMMEDIATELY and INLINE)
                     DDLogVerbose(@"Posting kMonalWillBeFreezed notification now...");
                     [[NSNotificationCenter defaultCenter] postNotificationName:kMonalWillBeFreezed object:nil];
@@ -1653,13 +1653,13 @@ -(void) handleBackgroundRefreshingTask:(BGTask*) task
                     //this has to be before account disconnects, to detect which accounts are not idle (e.g. have a sync error)
                     [HelperTools updateSyncErrorsWithDeleteOnly:YES andWaitForCompletion:YES];
 
-                    //disconnect all accounts to prevent TCP buffer leaking
-                    [[MLXMPPManager sharedInstance] disconnectAll];
-                    
                     //schedule a new BGProcessingTaskRequest to process this further as soon as possible
                     //(if we end up here, the graceful shuttdown did not work out because we are not idle --> we need more cpu time)
                     [HelperTools scheduleBackgroundTask:YES];      //force as soon as possible
 
+                    //disconnect all accounts to prevent TCP buffer leaking
+                    [[MLXMPPManager sharedInstance] disconnectAll];
+                    
                     //notify about pending app freeze (don't queue this notification because it should be handled IMMEDIATELY and INLINE)
                     DDLogVerbose(@"Posting kMonalWillBeFreezed notification now...");
                     [[NSNotificationCenter defaultCenter] postNotificationName:kMonalWillBeFreezed object:nil];
@@ -1880,13 +1880,13 @@ -(void) incomingWakeupWithCompletionHandler:(void (^)(UIBackgroundFetchResult re
                             BOOL wasIdle = [[MLXMPPManager sharedInstance] allAccountsIdle] && [MLFiletransfer isIdle];
                             [HelperTools updateSyncErrorsWithDeleteOnly:NO andWaitForCompletion:YES];
 
-                            //disconnect all accounts to prevent TCP buffer leaking
-                            [[MLXMPPManager sharedInstance] disconnectAll];
-                            
                             //schedule a new BGProcessingTaskRequest to process this further as soon as possible, if we are not idle
                             //(if we end up here, the graceful shuttdown did not work out because we are not idle --> we need more cpu time)
                             [HelperTools scheduleBackgroundTask:!wasIdle];
 
+                            //disconnect all accounts to prevent TCP buffer leaking
+                            [[MLXMPPManager sharedInstance] disconnectAll];
+                            
                             //notify about pending app freeze (don't queue this notification because it should be handled IMMEDIATELY and INLINE)
                             DDLogVerbose(@"Posting kMonalWillBeFreezed notification now...");
                             [[NSNotificationCenter defaultCenter] postNotificationName:kMonalWillBeFreezed object:nil];