Improvements to fast scroller

Now able to tap behind the fastscroller, aka the entire the right side of the screen, which helps actually tap the download button in manga details (and fixes #1113)

app/src/main/java/eu/kanade/tachiyomi/ui/base/MaterialFastScroll.kt

@@ -3,7 +3,6 @@ package eu.kanade.tachiyomi.ui.base
 import android.content.Context
 import android.util.AttributeSet
 import android.view.MotionEvent
-import androidx.core.view.ViewCompat
 import androidx.core.view.marginTop
 import androidx.recyclerview.widget.LinearLayoutManager
 import androidx.recyclerview.widget.RecyclerView
@@ -45,9 +44,9 @@ class MaterialFastScroll @JvmOverloads constructor(context: Context, attrs: Attr
             MotionEvent.ACTION_DOWN -> {
                 if (
                     if (context.resources.isLTR) {
-                        event.x < handle.x - ViewCompat.getPaddingStart(handle)
+                        event.x < handle.x - handle.paddingStart
                     } else {
-                        event.x > handle.width + ViewCompat.getPaddingStart(handle)
+                        event.x > handle.width + handle.paddingStart
                     }
                 ) return false
                 val y = event.y
@@ -59,7 +58,9 @@ class MaterialFastScroll @JvmOverloads constructor(context: Context, attrs: Attr
                     showScrollbar()
                     setBubbleAndHandlePosition(y)
                     setRecyclerViewPosition(y)
+                    return true
                 }
+                dispatchTouchToRecycler(event)
                 return true
             }
             MotionEvent.ACTION_MOVE -> {
@@ -70,6 +71,7 @@ class MaterialFastScroll @JvmOverloads constructor(context: Context, attrs: Attr
                     notifyScrollStateChange(true)
                     showBubble()
                     showScrollbar()
+                    dispatchTouchToRecycler(event) { action = MotionEvent.ACTION_CANCEL }
                 }
                 if (canScroll) {
                     setBubbleAndHandlePosition(y)
@@ -79,12 +81,23 @@ class MaterialFastScroll @JvmOverloads constructor(context: Context, attrs: Attr
             }
             MotionEvent.ACTION_UP, MotionEvent.ACTION_CANCEL -> {
                 startY = 0f
+                if (!canScroll) {
+                    dispatchTouchToRecycler(event)
+                }
                 canScroll = false
             }
         }
         return super.onTouchEvent(event)
     }
 
+    private fun dispatchTouchToRecycler(event: MotionEvent, block: (MotionEvent.() -> Unit)? = null) {
+        val ev2 = MotionEvent.obtain(event)
+        ev2.offsetLocation(this.x, this.y)
+        block?.invoke(ev2)
+        recyclerView.dispatchTouchEvent(ev2)
+        ev2.recycle()
+    }
+
     override fun setBubbleAndHandlePosition(y: Float) {
         super.setBubbleAndHandlePosition(y)
         if (bubbleEnabled) {

app/src/main/res/layout/chapters_item.xml

@@ -93,9 +93,8 @@
         <include
             layout="@layout/download_button"
             android:id="@+id/download_button"
-            android:layout_width="50dp"
+            android:layout_width="54dp"
             android:layout_height="0dp"
-            android:layout_marginEnd="4dp"
             app:layout_constraintBottom_toBottomOf="parent"
             app:layout_constraintEnd_toEndOf="parent"
             app:layout_constraintTop_toTopOf="parent" />

app/src/main/res/layout/download_button.xml

@@ -13,6 +13,7 @@
         android:layout_width="30dp"
         android:layout_height="30dp"
         android:layout_gravity="center"
+        android:contentDescription="@string/download"
         android:src="@drawable/border_circle"
         android:padding="3dp"/>
 
@@ -43,6 +44,7 @@
         app:tint="?attr/colorSecondary"
         android:layout_gravity="center"
         android:layout_width="30dp"
+        android:contentDescription="@string/download"
         android:layout_height="30dp"
         android:background="@drawable/round_ripple"
         android:padding="5dp"