Update mCurrentIndex on page move

Resolve #538

app/src/main/java/eu/kanade/tachiyomi/ui/reader/ReaderActivity.kt

@@ -281,12 +281,9 @@ class ReaderActivity : EhActivity() {
         mGalleryProvider!!.start()
 
         // Get start page
-        val startPage: Int = if (savedInstanceState == null) {
-            if (mPage >= 0) mPage else mGalleryProvider!!.startPage
-        } else {
-            mCurrentIndex
+        if (savedInstanceState == null) {
+            mCurrentIndex = if (mPage >= 0) mPage else mGalleryProvider!!.startPage
         }
-        mCurrentIndex = startPage
 
         lifecycleScope.launch(Dispatchers.Main) {
             mGalleryProvider!!.state.collect {
@@ -788,7 +785,7 @@ class ReaderActivity : EhActivity() {
             setTooltip(R.string.action_settings)
             val readerSettingSheetDialog = ReaderSettingsSheet(this@ReaderActivity)
             setOnClickListener {
-                if (!readerSettingSheetDialog.isShowing()) {
+                if (!readerSettingSheetDialog.isShowing) {
                     readerSettingSheetDialog.show()
                 }
             }
@@ -882,7 +879,8 @@ class ReaderActivity : EhActivity() {
         binding.pageSlider.valueTo = max(pages.lastIndex.toFloat(), 1f)
         binding.pageSlider.value = page.index.toFloat()
 
-        mGalleryProvider?.putStartPage(page.index)
+        mCurrentIndex = page.index
+        mGalleryProvider?.putStartPage(mCurrentIndex)
     }
 
     /**

app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/webtoon/WebtoonViewer.kt

@@ -12,16 +12,14 @@ import androidx.core.view.isGone
 import androidx.core.view.isVisible
 import androidx.recyclerview.widget.RecyclerView
 import androidx.recyclerview.widget.WebtoonLayoutManager
-import eu.kanade.tachiyomi.ui.reader.loader.PageLoader
 import eu.kanade.tachiyomi.ui.reader.ReaderActivity
+import eu.kanade.tachiyomi.ui.reader.loader.PageLoader
 import eu.kanade.tachiyomi.ui.reader.model.ReaderPage
 import eu.kanade.tachiyomi.ui.reader.viewer.BaseViewer
 import eu.kanade.tachiyomi.ui.reader.viewer.ViewerNavigation.NavigationRegion
 import eu.kanade.tachiyomi.util.system.logcat
 import kotlinx.coroutines.MainScope
 import kotlinx.coroutines.cancel
-import kotlin.math.max
-import kotlin.math.min
 
 /**
  * Implementation of a [BaseViewer] to display pages with a [RecyclerView].
@@ -171,9 +169,7 @@ class WebtoonViewer(val activity: ReaderActivity, val isContinuous: Boolean = tr
         val position = adapter.items.indexOf(page)
         if (position != -1) {
             layoutManager.scrollToPositionWithOffset(position, 0)
-            if (layoutManager.findLastEndVisibleItemPosition() == -1) {
-                onScrolled(pos = position)
-            }
+            onScrolled(pos = position)
         } else {
             logcat { "Page $page not found in adapter" }
         }