Fix double page progress when changing orientation (#799)

* Fix double page when changing orientation

* Fix requested page, when device config changes when app is in BG

* Cleanup on save reader logic

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

@@ -614,6 +614,9 @@ class ReaderViewModel(
      * If incognito mode isn't on or has at least 1 tracker
      */
     private suspend fun saveChapterProgress(readerChapter: ReaderChapter) {
+        // SY -->
+        readerChapter.requestedPage = readerChapter.chapter.last_page_read
+        // SY <--
         if (!incognitoMode || hasTrackers) {
             val chapter = readerChapter.chapter
             getCurrentChapter()?.requestedPage = chapter.last_page_read

app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/pager/Pager.kt

@@ -1,6 +1,7 @@
 package eu.kanade.tachiyomi.ui.reader.viewer.pager
 
 import android.content.Context
+import android.os.Parcelable
 import android.view.HapticFeedbackConstants
 import android.view.KeyEvent
 import android.view.MotionEvent
@@ -27,6 +28,18 @@ open class Pager(
      */
     var longTapListener: ((MotionEvent) -> Boolean)? = null
 
+    // SY -->
+    var isRestoring = false
+
+    override fun onRestoreInstanceState(state: Parcelable?) {
+        isRestoring = true
+        val currentItem = currentItem
+        super.onRestoreInstanceState(state)
+        setCurrentItem(currentItem, false)
+        isRestoring = false
+    }
+    // SY <--
+
     /**
      * Gesture listener that implements tap and long tap events.
      */

app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/pager/PagerViewer.kt

@@ -86,6 +86,9 @@ abstract class PagerViewer(val activity: ReaderActivity) : BaseViewer {
 
     private val pagerListener = object : ViewPager.SimpleOnPageChangeListener() {
         override fun onPageSelected(position: Int) {
+            // SY -->
+            if (pager.isRestoring) return
+            // SY <--
             if (activity.isScrollingThroughPages.not()) {
                 activity.hideMenu()
             }