Fix reader state on changed

app/src/main/kotlin/org/koitharu/kotatsu/reader/ui/pager/BaseReaderAdapter.kt

@@ -22,6 +22,9 @@ abstract class BaseReaderAdapter<H : BasePageHolder<*>>(
 
 	private val differ = AsyncListDiffer(this, DiffCallback())
 
+	val hasItems: Boolean
+		get() = itemCount != 0
+
 	init {
 		stateRestorationPolicy = StateRestorationPolicy.PREVENT
 	}

app/src/main/kotlin/org/koitharu/kotatsu/reader/ui/pager/BaseReaderFragment.kt

@@ -29,7 +29,11 @@ abstract class BaseReaderFragment<B : ViewBinding> : BaseFragment<B>(), ZoomCont
 		readerAdapter = onCreateAdapter()
 
 		viewModel.content.observe(viewLifecycleOwner) {
-			onPagesChanged(it.pages, restoredState ?: it.state)
+			var pendingState = restoredState ?: it.state
+			if (pendingState == null && readerAdapter?.hasItems != true) {
+				pendingState = viewModel.getCurrentState()
+			}
+			onPagesChanged(it.pages, pendingState)
 			restoredState = null
 		}
 	}