Start sync if enqueued when app is backgrounded

app/src/main/java/org/tasks/Tasks.kt

@@ -70,6 +70,12 @@ class Tasks : Application(), Configuration.Provider {
                         }
                     }
                 }
+
+                override fun onPause(owner: LifecycleOwner) {
+                    owner.lifecycle.coroutineScope.launch {
+                        workManager.get().startEnqueuedSync()
+                    }
+                }
             }
         )
     }

app/src/main/java/org/tasks/jobs/WorkManager.kt

@@ -18,6 +18,8 @@ interface WorkManager {
 
     suspend fun sync(immediate: Boolean)
 
+    suspend fun startEnqueuedSync()
+
     fun reverseGeocode(place: Place)
 
     fun updateBackgroundSync()

app/src/main/java/org/tasks/jobs/WorkManagerImpl.kt

@@ -91,19 +91,21 @@ class WorkManagerImpl(
         }
     }
 
+    override suspend fun startEnqueuedSync() {
+        if (getSyncJob().any { it.state == WorkInfo.State.ENQUEUED }) {
+            sync(true)
+        }
+    }
+
     override suspend fun sync(immediate: Boolean) {
-        Timber.d("sync(immediate = $immediate)")
         val builder = OneTimeWorkRequest.Builder(SyncWork::class.java)
                 .setInputData(EXTRA_IMMEDIATE to immediate)
                 .setConstraints(networkConstraints)
         if (!immediate) {
             builder.setInitialDelay(1, TimeUnit.MINUTES)
         }
-        val append = withContext(Dispatchers.IO) {
-            workManager.getWorkInfosByTag(TAG_SYNC).get().any {
-                it.state == WorkInfo.State.RUNNING
-            }
-        }
+        val append = getSyncJob().any { it.state == WorkInfo.State.RUNNING }
+        Timber.d("sync: immediate=$immediate, append=$append)")
         enqueue(workManager.beginUniqueWork(
                 TAG_SYNC,
                 if (append) APPEND_OR_REPLACE else REPLACE,
@@ -256,6 +258,10 @@ class WorkManagerImpl(
                 )
             }
         }
+
+    private suspend fun getSyncJob() = withContext(Dispatchers.IO) {
+        workManager.getWorkInfosForUniqueWork(TAG_SYNC).get()
+    }
 }
 
 private fun <B : WorkRequest.Builder<B, *>, W : WorkRequest> WorkRequest.Builder<B, W>.setInputData(