Use recursive queries if filter can be sorted

app/src/main/java/com/todoroo/astrid/dao/TaskDao.kt

@@ -13,7 +13,6 @@ import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.coroutineScope
 import kotlinx.coroutines.launch
 import org.tasks.LocalBroadcastManager
-import org.tasks.data.SubtaskInfo
 import org.tasks.data.TaskContainer
 import org.tasks.data.TaskDao
 import org.tasks.date.DateTimeUtils.isAfterNow
@@ -151,7 +150,7 @@ class TaskDao @Inject constructor(
 
     internal suspend fun insert(task: Task): Long = taskDao.insert(task)
 
-    internal suspend fun fetchTasks(callback: suspend (SubtaskInfo) -> List<String>): List<TaskContainer> =
+    internal suspend fun fetchTasks(callback: suspend () -> List<String>): List<TaskContainer> =
             taskDao.fetchTasks(callback)
 
     internal suspend fun getAll(): List<Task> = taskDao.getAll()

app/src/main/java/org/tasks/data/SubtaskInfo.java

@@ -1,8 +0,0 @@
-package org.tasks.data;
-
-public class SubtaskInfo {
-  public boolean hasSubtasks;
-  public boolean usesSubtasks() {
-    return hasSubtasks;
-  }
-}

app/src/main/java/org/tasks/data/TaskDao.kt

@@ -95,14 +95,10 @@ abstract class TaskDao(private val database: Database) {
             + "WHERE completed > 0 AND calendarUri IS NOT NULL AND calendarUri != ''")
     abstract suspend fun clearCompletedCalendarEvents(): Int
 
-    open suspend fun fetchTasks(callback: suspend (SubtaskInfo) -> List<String>): List<TaskContainer> {
-        return fetchTasks(getSubtaskInfo(), callback)
-    }
-
-    open suspend fun fetchTasks(subtasks: SubtaskInfo, callback: suspend (SubtaskInfo) -> List<String>): List<TaskContainer> =
+    open suspend fun fetchTasks(callback: suspend () -> List<String>): List<TaskContainer> =
             database.withTransaction {
                 val start = if (BuildConfig.DEBUG) now() else 0
-                val queries = callback(subtasks)
+                val queries = callback()
                 val last = queries.size - 1
                 for (i in 0 until last) {
                     query(SimpleSQLiteQuery(queries[i]))
@@ -114,7 +110,7 @@ abstract class TaskDao(private val database: Database) {
 
     suspend fun fetchTasks(preferences: Preferences, filter: Filter): List<TaskContainer> =
             fetchTasks {
-                TaskListQuery.getQuery(preferences, filter, it)
+                TaskListQuery.getQuery(preferences, filter)
             }
 
     @RawQuery
@@ -126,9 +122,6 @@ abstract class TaskDao(private val database: Database) {
     @RawQuery
     abstract suspend fun count(query: SimpleSQLiteQuery): Int
 
-    @Query("SELECT EXISTS(SELECT 1 FROM tasks WHERE parent > 0 AND deleted = 0) AS hasSubtasks")
-    abstract suspend fun getSubtaskInfo(): SubtaskInfo
-
     suspend fun touch(ids: List<Long>, now: Long = currentTimeMillis()) =
         ids.eachChunk { internalTouch(it, now) }
 

app/src/main/java/org/tasks/data/TaskListQuery.kt

@@ -33,13 +33,12 @@ object TaskListQuery {
     fun getQuery(
             preferences: QueryPreferences,
             filter: Filter,
-            subtasks: SubtaskInfo
     ): MutableList<String> = when {
         filter.supportsManualSort() && preferences.isManualSort ->
             getRecursiveQuery(filter, preferences)
         filter.supportsAstridSorting() && preferences.isAstridSort ->
             getNonRecursiveQuery(filter, preferences)
-        filter.supportsSubtasks() && subtasks.usesSubtasks() ->
+        filter.supportsSorting() ->
             getRecursiveQuery(filter, preferences)
         else -> getNonRecursiveQuery(filter, preferences)
     }

app/src/main/java/org/tasks/ui/TaskListViewModel.kt

@@ -9,7 +9,6 @@ import com.todoroo.andlib.utility.AndroidUtilities
 import com.todoroo.astrid.api.Filter
 import dagger.hilt.android.lifecycle.HiltViewModel
 import kotlinx.coroutines.launch
-import org.tasks.data.SubtaskInfo
 import org.tasks.data.TaskContainer
 import org.tasks.data.TaskDao
 import org.tasks.data.TaskListQuery.getQuery
@@ -53,18 +52,13 @@ class TaskListViewModel @Inject constructor(
         }
         try {
             viewModelScope.launch {
-                val subtasks = taskDao.getSubtaskInfo()
-                performNonPagedQuery(subtasks)
+                _tasks.value = taskDao.fetchTasks { getQuery(preferences, filter!!) }
             }
         } catch (e: Exception) {
             Timber.e(e)
         }
     }
 
-    private suspend fun performNonPagedQuery(subtasks: SubtaskInfo) {
-        _tasks.value = taskDao.fetchTasks(subtasks) { getQuery(preferences, filter!!, it) }
-    }
-
     val value: List<TaskContainer>
         get() = _tasks.value ?: emptyList()
 }

app/src/main/java/org/tasks/widget/ScrollableViewsFactory.kt

@@ -18,7 +18,6 @@ import kotlinx.coroutines.runBlocking
 import org.tasks.BuildConfig
 import org.tasks.LocalBroadcastManager
 import org.tasks.R
-import org.tasks.data.SubtaskInfo
 import org.tasks.data.TaskContainer
 import org.tasks.data.TaskDao
 import org.tasks.data.TaskListQuery.getQuery
@@ -99,7 +98,7 @@ internal class ScrollableViewsFactory(
         runBlocking {
             updateSettings()
             tasks = SectionedDataSource(
-                    taskDao.fetchTasks { getQuery(filter, it) },
+                    taskDao.fetchTasks { getQuery(filter) },
                     disableGroups,
                     groupMode,
                     collapsed,
@@ -295,8 +294,8 @@ internal class ScrollableViewsFactory(
 
     private fun getTask(position: Int): TaskContainer? = tasks.getItem(position)
 
-    private suspend fun getQuery(filter: Filter?, subtasks: SubtaskInfo): List<String> {
-        val queries = getQuery(widgetPreferences, filter!!, subtasks)
+    private suspend fun getQuery(filter: Filter?): List<String> {
+        val queries = getQuery(widgetPreferences, filter!!)
         val last = queries.size - 1
         queries[last] =
                 subtasksHelper.applySubtasksToWidgetFilter(filter, widgetPreferences, queries[last])