More Fab work + Checks for duplicate snackbars

app/src/main/java/eu/kanade/tachiyomi/ui/manga/chapter/ChaptersController.kt

@@ -121,7 +121,7 @@ class ChaptersController : NucleusController<ChaptersPresenter>(),
                 if (!reveal_view.showRevealEffect(coordinates.x, coordinates.y, revealAnimationListener)) {
                     openChapter(item.chapter)
                 }
-            } else {
+            } else if (snack == null || snack?.getText() != view.context.getString(R.string.no_next_chapter)) {
                 snack = view.snack(R.string.no_next_chapter, Snackbar.LENGTH_LONG) {
                     addCallback(object : BaseTransientBottomBar.BaseCallback<Snackbar>() {
                         override fun onDismissed(transientBottomBar: Snackbar?, event: Int) {

app/src/main/java/eu/kanade/tachiyomi/widget/FABAnimationUpDown.kt

@@ -11,7 +11,6 @@ import androidx.interpolator.view.animation.FastOutSlowInInterpolator
 import com.google.android.material.floatingactionbutton.FloatingActionButton
 import com.google.android.material.snackbar.Snackbar
 import eu.kanade.tachiyomi.R
-import timber.log.Timber
 import kotlin.math.min
 
 @Suppress("unused", "UNUSED_PARAMETER")
@@ -68,7 +67,6 @@ class FABAnimationUpDown @JvmOverloads constructor(ctx: Context, attrs: Attribut
         for (i in 0 until dependencies.size) {
             val view = dependencies[i]
             if (view is Snackbar.SnackbarLayout) {
-                Timber.d("snack y: ${view.translationY}")
                 minOffset = min(minOffset, view.translationY - view.height)
             }
         }

app/src/main/java/eu/kanade/tachiyomi/widget/FABMoveBehaviour.kt

@@ -0,0 +1,34 @@
+package eu.kanade.tachiyomi.widget
+
+import android.content.Context
+import android.util.AttributeSet
+import android.view.View
+import androidx.coordinatorlayout.widget.CoordinatorLayout
+import com.google.android.material.floatingactionbutton.FloatingActionButton
+import com.google.android.material.snackbar.Snackbar
+import kotlin.math.min
+
+class FABMoveBehaviour(context: Context, attrs: AttributeSet) :
+    CoordinatorLayout.Behavior<FloatingActionButton>(context, attrs) {
+
+    override fun layoutDependsOn(parent: CoordinatorLayout, child: FloatingActionButton, dependency: View): Boolean {
+        return dependency is Snackbar.SnackbarLayout
+    }
+    override fun onDependentViewChanged(parent: CoordinatorLayout, child: FloatingActionButton, dependency: View): Boolean {
+        val translationY = getFabTranslationYForSnackbar(parent, child)
+        child.translationY = translationY
+        return true
+    }
+
+    private fun getFabTranslationYForSnackbar(parent: CoordinatorLayout, fab: FloatingActionButton): Float {
+        var minOffset = 0f
+        val dependencies = parent.getDependencies(fab)
+        for (i in 0 until dependencies.size) {
+            val view = dependencies[i]
+            if (view is Snackbar.SnackbarLayout) {
+                minOffset = min(minOffset, view.translationY - view.height)
+            }
+        }
+        return minOffset
+    }
+}

app/src/main/res/values/styles.xml

@@ -152,7 +152,9 @@
         <item name="android:layout_gravity">bottom|end</item>
         <item name="android:layout_margin">@dimen/fab_margin</item>
         <item name="android:scaleType">fitCenter</item>
+        <item name="layout_anchorGravity">bottom|right|end</item>
         <item name="android:tint">@color/md_white_1000</item>
+        <item name="layout_behavior">eu.kanade.tachiyomi.widget.FABMoveBehaviour</item>
     </style>
 
     <style name="Theme.Widget.CardView" parent="CardView">