Add initial selectAll methods

app/src/main/java/com/lagradost/cloudstream3/ui/download/DownloadAdapter.kt

@@ -330,6 +330,16 @@ class DownloadAdapter(
         }
     }
 
+    fun selectAllItems() {
+        currentList.forEachIndexed { index, item ->
+            val id = item.data.id
+            if (selectedIds[id] == true) return@forEachIndexed
+
+            selectedIds[id] = true
+            notifyItemChanged(index)
+        }
+    }
+
     private fun toggleIsChecked(checkbox: CheckBox, id: Int, name: String) {
         val isChecked = !checkbox.isChecked
         checkbox.isChecked = isChecked

app/src/main/java/com/lagradost/cloudstream3/ui/download/DownloadViewModel.kt

@@ -57,6 +57,16 @@ class DownloadViewModel : ViewModel() {
         }
     }
 
+    fun selectAllItems() {
+        val currentSelected = selectedIds.value ?: HashMap()
+        val items = headerCards.value ?: return
+        items.forEach { item ->
+            if (currentSelected.containsKey(item.data.id)) return@forEach
+            currentSelected[item.data.id] = item.data.name
+        }
+        _selectedIds.postValue(currentSelected)
+    }
+
     fun clearSelectedIds() {
         _selectedIds.postValue(HashMap())
     }