Restore state of ssiv

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

@@ -69,7 +69,7 @@ open class PageHolder(
 	override fun onImageShowing(zoom: ZoomMode) {
 		binding.ssiv.maxScale = 2f * maxOf(
 			binding.ssiv.width / binding.ssiv.sWidth.toFloat(),
-			binding.ssiv.height / binding.ssiv.sHeight.toFloat()
+			binding.ssiv.height / binding.ssiv.sHeight.toFloat(),
 		)
 		when (zoom) {
 			ZoomMode.FIT_CENTER -> {
@@ -81,7 +81,7 @@ open class PageHolder(
 				binding.ssiv.minScale = binding.ssiv.height / binding.ssiv.sHeight.toFloat()
 				binding.ssiv.setScaleAndCenter(
 					binding.ssiv.minScale,
-					PointF(0f, binding.ssiv.sHeight / 2f)
+					PointF(0f, binding.ssiv.sHeight / 2f),
 				)
 			}
 			ZoomMode.FIT_WIDTH -> {
@@ -89,14 +89,14 @@ open class PageHolder(
 				binding.ssiv.minScale = binding.ssiv.width / binding.ssiv.sWidth.toFloat()
 				binding.ssiv.setScaleAndCenter(
 					binding.ssiv.minScale,
-					PointF(binding.ssiv.sWidth / 2f, 0f)
+					PointF(binding.ssiv.sWidth / 2f, 0f),
 				)
 			}
 			ZoomMode.KEEP_START -> {
 				binding.ssiv.setMinimumScaleType(SubsamplingScaleImageView.SCALE_TYPE_CENTER_INSIDE)
 				binding.ssiv.setScaleAndCenter(
 					binding.ssiv.maxScale,
-					PointF(0f, 0f)
+					PointF(0f, 0f),
 				)
 			}
 		}
@@ -115,9 +115,9 @@ open class PageHolder(
 	override fun onError(e: Throwable) {
 		bindingInfo.textViewError.text = e.getDisplayMessage(context.resources)
 		bindingInfo.buttonRetry.setText(
-			ExceptionResolver.getResolveStringId(e).ifZero { R.string.try_again }
+			ExceptionResolver.getResolveStringId(e).ifZero { R.string.try_again },
 		)
 		bindingInfo.layoutError.isVisible = true
 		bindingInfo.progressBar.hideCompat()
 	}
-}
+}

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

@@ -1,13 +1,15 @@
 <?xml version="1.0" encoding="utf-8"?>
 <FrameLayout
 	xmlns:android="http://schemas.android.com/apk/res/android"
+	xmlns:app="http://schemas.android.com/apk/res-auto"
 	android:layout_width="match_parent"
 	android:layout_height="match_parent">
 
 	<com.davemorrissey.labs.subscaleview.SubsamplingScaleImageView
 		android:id="@+id/ssiv"
 		android:layout_width="match_parent"
-		android:layout_height="match_parent" />
+		android:layout_height="match_parent"
+		app:restoreStrategy="deferred" />
 
 	<com.google.android.material.appbar.MaterialToolbar
 		android:id="@+id/toolbar"
@@ -21,4 +23,4 @@
 		android:layout_gravity="center"
 		android:indeterminate="true" />
 
-</FrameLayout>
+</FrameLayout>

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

@@ -1,6 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <FrameLayout
 	xmlns:android="http://schemas.android.com/apk/res/android"
+	xmlns:app="http://schemas.android.com/apk/res-auto"
 	xmlns:tools="http://schemas.android.com/tools"
 	android:layout_width="match_parent"
 	android:layout_height="match_parent"
@@ -9,7 +10,8 @@
 	<com.davemorrissey.labs.subscaleview.SubsamplingScaleImageView
 		android:id="@+id/ssiv"
 		android:layout_width="match_parent"
-		android:layout_height="match_parent" />
+		android:layout_height="match_parent"
+		app:restoreStrategy="deferred" />
 
 	<TextView
 		android:id="@+id/textView_number"
@@ -24,4 +26,4 @@
 
 	<include layout="@layout/layout_page_info" />
 
-</FrameLayout>
+</FrameLayout>