fix: properly switch to custom sorting when order is modified

Author: naveensingh

app/src/main/kotlin/org/fossify/notes/fragments/TasksFragment.kt

@@ -282,7 +282,7 @@ class TasksFragment : NoteFragment(), TasksActionListener {
     }
 
     override fun moveTask(fromPosition: Int, toPosition: Int) {
-        activity?.config?.sorting = SORT_BY_CUSTOM
+        switchToCustomSorting()
         if (fromPosition < toPosition) {
             for (i in fromPosition until toPosition) {
                 tasks.swap(i, i + 1)
@@ -297,12 +297,16 @@ class TasksFragment : NoteFragment(), TasksActionListener {
         setupAdapter()
     }
 
-    override fun moveTasksToTop(taskIds: List<Int>) = moveTasks(taskIds.reversed(), targetPosition = 0)
+    override fun moveTasksToTop(taskIds: List<Int>) {
+        moveTasks(taskIds.reversed(), targetPosition = 0)
+    }
 
-    override fun moveTasksToBottom(taskIds: List<Int>) = moveTasks(taskIds, targetPosition = tasks.lastIndex)
+    override fun moveTasksToBottom(taskIds: List<Int>) {
+        moveTasks(taskIds, targetPosition = tasks.lastIndex)
+    }
 
     private fun moveTasks(taskIds: List<Int>, targetPosition: Int) {
-        activity?.config?.sorting = SORT_BY_CUSTOM
+        switchToCustomSorting()
         taskIds.forEach { id ->
             val position = tasks.indexOfFirst { it.id == id }
             if (position != -1) {
@@ -319,6 +323,15 @@ class TasksFragment : NoteFragment(), TasksActionListener {
         }
     }
 
+    private fun switchToCustomSorting() {
+        val config = activity?.config ?: return
+        if (config.hasOwnSorting(noteId) == true) {
+            config.saveOwnSorting(noteId, SORT_BY_CUSTOM)
+        } else {
+            config.sorting = SORT_BY_CUSTOM
+        }
+    }
+
     private fun FragmentChecklistBinding.toCommonBinding(): CommonNoteBinding = this.let {
         object : CommonNoteBinding {
             override val root: View = it.root