properly clean up removed widgets from the database

app/src/main/kotlin/com/simplemobiletools/notes/pro/helpers/MyWidgetProvider.kt

@@ -48,4 +48,13 @@ class MyWidgetProvider : AppWidgetProvider() {
             }
         }.start()
     }
+
+    override fun onDeleted(context: Context, appWidgetIds: IntArray) {
+        super.onDeleted(context, appWidgetIds)
+        Thread {
+            appWidgetIds.forEach {
+                context.widgetsDB.deleteWidgetId(it)
+            }
+        }.start()
+    }
 }

app/src/main/kotlin/com/simplemobiletools/notes/pro/interfaces/WidgetsDao.kt

@@ -16,4 +16,7 @@ interface WidgetsDao {
 
     @Query("DELETE FROM widgets WHERE note_id = :noteId")
     fun deleteNoteWidgets(noteId: Long)
+
+    @Query("DELETE FROM widgets WHERE widget_id = :widgetId")
+    fun deleteWidgetId(widgetId: Int)
 }

app/src/main/kotlin/com/simplemobiletools/notes/pro/models/Widget.kt

@@ -7,6 +7,6 @@ import androidx.room.PrimaryKey
 
 @Entity(tableName = "widgets", indices = [(Index(value = ["widget_id"], unique = true))])
 data class Widget(
-        @PrimaryKey(autoGenerate = true) var id: Int?,
+        @PrimaryKey(autoGenerate = true) var id: Long?,
         @ColumnInfo(name = "widget_id") var widgetId: Int,
         @ColumnInfo(name = "note_id") var noteId: Long)