notes: add icons to use previous/next event as template

app/src/main/java/it/danieleverducci/lunatracker/MainActivity.kt

@@ -303,13 +303,17 @@ class MainActivity : AppCompatActivity() {
 
         fun updateContent(current: LunaEvent) {
             val prevEvent = getPreviousSameEvent(current, allEvents)
-            val nextEvent = getNextSameEvent(current, allEvents)
+            var nextEvent = getNextSameEvent(current, allEvents)
 
             notesET.setText(current.notes)
             if (useQuantity) {
                 qtyET.setText(current.quantity.toString())
             }
 
+            if (nextEvent == null && current != lunaEvent) {
+                nextEvent = lunaEvent
+            }
+
             if (nextEvent != null) {
                 nextTextView.setOnClickListener {
                     notesET.setText(nextEvent.notes)
@@ -322,12 +326,6 @@ class MainActivity : AppCompatActivity() {
             } else {
                 nextTextView.setOnClickListener {}
                 nextTextView.alpha = 0.5f
-
-                // clear fields
-                notesET.setText("")
-                if (useQuantity) {
-                    qtyET.setText("")
-                }
             }
 
             if (prevEvent != null) {