Added a check against view being initialized in its behavior

The view will be simply hidden if not

app/src/main/java/com/topjohnwu/magisk/utils/HideBottomViewOnScrollBehavior.kt

@@ -3,6 +3,7 @@ package com.topjohnwu.magisk.utils
 import android.view.View
 import android.view.ViewGroup
 import androidx.coordinatorlayout.widget.CoordinatorLayout
+import androidx.core.view.isGone
 import androidx.core.view.isVisible
 import androidx.core.view.updateLayoutParams
 import androidx.interpolator.view.animation.FastOutSlowInInterpolator
@@ -15,10 +16,16 @@ class HideBottomViewOnScrollBehavior<V : View> : HideBottomViewOnScrollBehavior<
     HideableBehavior<V> {
 
     private var lockState: Boolean = false
+    private var isLaidOut = false
 
     override fun layoutDependsOn(parent: CoordinatorLayout, child: V, dependency: View) =
         super.layoutDependsOn(parent, child, dependency) or (dependency is Snackbar.SnackbarLayout)
 
+    override fun onLayoutChild(parent: CoordinatorLayout, child: V, layoutDirection: Int): Boolean {
+        isLaidOut = true
+        return super.onLayoutChild(parent, child, layoutDirection)
+    }
+
     override fun onDependentViewChanged(
         parent: CoordinatorLayout,
         child: V,
@@ -92,8 +99,15 @@ class HideBottomViewOnScrollBehavior<V : View> : HideBottomViewOnScrollBehavior<
         }
 
         if (hide) {
-            slideDown(view)
+            // view is not laid out and drawn yet properly, so animation will not be attached
+            // hence we just simply hide the view
+            if (!isLaidOut) {
+                view.isGone = true
             } else {
+                slideDown(view)
+            }
+        } else {
+            view.isVisible = true
             slideUp(view)
         }