Prevent GoneOnInvisibleListener leak

app/src/main/java/org/koitharu/kotatsu/reader/ui/pager/BasePageHolder.kt

@@ -37,11 +37,13 @@ abstract class BasePageHolder<B : ViewBinding>(
 
 	protected abstract fun onBind(data: ReaderPage)
 
-	fun onAttachedToWindow() {
+	@CallSuper
+	open fun onAttachedToWindow() {
 		delegate.onAttachedToWindow()
 	}
 
-	fun onDetachedFromWindow() {
+	@CallSuper
+	open fun onDetachedFromWindow() {
 		delegate.onDetachedFromWindow()
 	}
 

app/src/main/java/org/koitharu/kotatsu/reader/ui/pager/webtoon/WebtoonHolder.kt

@@ -25,12 +25,12 @@ class WebtoonHolder(
 	View.OnClickListener {
 
 	private var scrollToRestore = 0
+	private val goneOnInvisibleListener = GoneOnInvisibleListener(bindingInfo.progressBar)
 
 	init {
 		binding.ssiv.regionDecoderFactory = SkiaPooledImageRegionDecoder.Factory()
 		binding.ssiv.addOnImageEventListener(delegate)
 		bindingInfo.buttonRetry.setOnClickListener(this)
-		GoneOnInvisibleListener(bindingInfo.progressBar).attach()
 	}
 
 	override fun onBind(data: ReaderPage) {
@@ -42,6 +42,16 @@ class WebtoonHolder(
 		binding.ssiv.recycle()
 	}
 
+	override fun onAttachedToWindow() {
+		super.onAttachedToWindow()
+		goneOnInvisibleListener.attach()
+	}
+
+	override fun onDetachedFromWindow() {
+		super.onDetachedFromWindow()
+		goneOnInvisibleListener.detach()
+	}
+
 	override fun onLoadingStarted() {
 		bindingInfo.layoutError.isVisible = false
 		bindingInfo.progressBar.showCompat()

app/src/main/java/org/koitharu/kotatsu/utils/GoneOnInvisibleListener.kt

@@ -19,5 +19,10 @@ class GoneOnInvisibleListener(
 
 	fun attach() {
 		view.viewTreeObserver.addOnGlobalLayoutListener(this)
+		onGlobalLayout()
 	}
-}
+
+	fun detach() {
+		view.viewTreeObserver.removeOnGlobalLayoutListener(this)
+	}
+}