Fix completed task group header

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

@@ -10,6 +10,7 @@ public class TaskContainer {
   @Embedded public SubsetGoogleTask googletask;
   @Embedded public SubsetCaldav caldavTask;
   @Embedded public Location location;
+  public Boolean parentComplete;
   public String tags;
   public int children;
   public Long sortGroup;

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

@@ -25,7 +25,9 @@ internal object TaskListQueryRecursive {
                     field("sort_group").`as`("sortGroup"),
                     field("children"),
                     field("primary_sort").`as`("primarySort"),
-                    field("secondary_sort").`as`("secondarySort"))).toTypedArray()
+                    field("secondary_sort").`as`("secondarySort"),
+                    field("parent_complete").`as`("parentComplete"),
+            )).toTypedArray()
     private val JOINS = """
         ${Join.inner(RECURSIVE, Task.ID.eq(RECURSIVE_TASK))}
         LEFT JOIN (SELECT parent, count(distinct recursive_tasks.task) AS children FROM recursive_tasks GROUP BY parent) AS recursive_children ON recursive_children.parent = tasks._id

app/src/main/java/org/tasks/tasklist/SectionedDataSource.kt

@@ -62,7 +62,7 @@ class SectionedDataSource constructor(
         for (i in tasks.indices) {
             val task = tasks[i]
             val sortGroup = task.sortGroup ?: continue
-            val header = if (task.isCompleted && !task.hasParent()) {
+            val header = if (task.parentComplete) {
                 HEADER_COMPLETED
             } else if (sortMode == SortHelper.SORT_IMPORTANCE || sortGroup == 0L) {
                 sortGroup
@@ -82,8 +82,8 @@ class SectionedDataSource constructor(
                 val previousTask = tasks[i - 1]
                 val previous = previousTask.sortGroup
                 when {
-                    task.isCompleted && !task.hasParent() -> {
+                    task.parentComplete -> {
-                        if (!previousTask.isCompleted) {
+                        if (!previousTask.parentComplete) {
                             sections.add(AdapterSection(i, header, 0, isCollapsed))
                         }
                     }