Cancel thumb view touches with ACTION_CANCEL (#23)

Author: DSteve595

indicator-fast-scroll/src/main/java/com/reddit/indicatorfastscroll/FastScrollerView.kt

@@ -301,7 +301,7 @@ class FastScrollerView @JvmOverloads constructor(
   override fun onTouchEvent(event: MotionEvent): Boolean {
     fun View.containsY(y: Int) = y in (top until bottom)
 
-    if (event.action == MotionEvent.ACTION_UP) {
+    if (event.action in MOTIONEVENT_STOP_ACTIONS) {
       isPressed = false
       lastSelectedPosition = null
       onItemIndicatorTouched?.invoke(false)
@@ -347,6 +347,11 @@ class FastScrollerView @JvmOverloads constructor(
 
   companion object {
 
+    private val MOTIONEVENT_STOP_ACTIONS = intArrayOf(
+      MotionEvent.ACTION_UP,
+      MotionEvent.ACTION_CANCEL
+    )
+
     private fun FastScrollerView.createAdapterDataObserver(): RecyclerView.AdapterDataObserver {
       return object : RecyclerView.AdapterDataObserver() {
         override fun onChanged() {