properly handle the default portrait image selection

app/src/main/kotlin/com/simplemobiletools/gallery/pro/adapters/PortraitPhotosAdapter.kt

@@ -18,7 +18,7 @@ import java.util.*
 class PortraitPhotosAdapter(val context: Context, val photos: ArrayList<String>, val sideElementWidth: Int, val itemClick: (Int, Int) -> Unit) :
         RecyclerView.Adapter<PortraitPhotosAdapter.ViewHolder>() {
 
-    private var currentSelection = photos.firstOrNull { it.contains("cover", true) } ?: photos.firstOrNull { it.isNotEmpty() }
+    var currentSelectionIndex = -1
     private var strokeBackground = context.resources.getDrawable(R.drawable.stroke_background)
     private val itemWidth = context.resources.getDimension(R.dimen.portrait_photos_stripe_height).toInt()
 
@@ -33,12 +33,9 @@ class PortraitPhotosAdapter(val context: Context, val photos: ArrayList<String>,
 
     override fun getItemCount() = photos.size
 
-    fun getCurrentPhoto() = currentSelection
+    fun setCurrentPhoto(position: Int) {
-
+        if (currentSelectionIndex != position) {
-    private fun setCurrentPhoto(position: Int) {
+            currentSelectionIndex = position
-        val newPhoto = photos.getOrNull(position) ?: return
-        if (currentSelection != newPhoto) {
-            currentSelection = newPhoto
             notifyDataSetChanged()
         }
     }
@@ -52,7 +49,7 @@ class PortraitPhotosAdapter(val context: Context, val photos: ArrayList<String>,
                     itemWidth
                 }
 
-                portrait_photo_item_thumbnail.background = if (photo.isEmpty() || getCurrentPhoto() != photo) {
+                portrait_photo_item_thumbnail.background = if (photo.isEmpty() || position != currentSelectionIndex) {
                     null
                 } else {
                     strokeBackground

app/src/main/kotlin/com/simplemobiletools/gallery/pro/fragments/PhotoFragment.kt

@@ -448,13 +448,6 @@ class PhotoFragment : ViewPagerFragment() {
     }
 
     private fun showPortraitStripe() {
-        var bottomMargin = context!!.navigationBarHeight + context!!.resources.getDimension(R.dimen.normal_margin).toInt()
-        if (context!!.config.bottomActions) {
-            bottomMargin += context!!.resources.getDimension(R.dimen.bottom_actions_height).toInt()
-        }
-        (mView.photo_portrait_stripe_wrapper.layoutParams as RelativeLayout.LayoutParams).bottomMargin = bottomMargin
-        mView.photo_portrait_stripe_wrapper.beVisible()
-
         val files = File(mMedium.parentPath).listFiles()?.toMutableList() as? ArrayList<File>
         if (files != null) {
             val screenWidth = context!!.realScreenSize.x
@@ -486,6 +479,33 @@ class PhotoFragment : ViewPagerFragment() {
             }
 
             mView.photo_portrait_stripe.adapter = adapter
+
+            var bottomMargin = context!!.navigationBarHeight + context!!.resources.getDimension(R.dimen.normal_margin).toInt()
+            if (context!!.config.bottomActions) {
+                bottomMargin += context!!.resources.getDimension(R.dimen.bottom_actions_height).toInt()
+            }
+            (mView.photo_portrait_stripe_wrapper.layoutParams as RelativeLayout.LayoutParams).bottomMargin = bottomMargin
+
+            var coverIndex = -1
+            paths.forEachIndexed { index, path ->
+                if (path.contains("cover", true)) {
+                    coverIndex = index
+                }
+            }
+
+            if (coverIndex == -1) {
+                paths.forEachIndexed { index, path ->
+                    if (path.isNotEmpty()) {
+                        coverIndex = index
+                    }
+                }
+            }
+
+            mView.photo_portrait_stripe.onGlobalLayout {
+                mView.photo_portrait_stripe.scrollBy((coverIndex - fakeItemsCnt) * itemWidth, 0)
+                adapter.setCurrentPhoto(coverIndex)
+                mView.photo_portrait_stripe_wrapper.beVisible()
+            }
         }
     }
 

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

@@ -84,7 +84,7 @@
         android:layout_width="match_parent"
         android:layout_height="@dimen/portrait_photos_stripe_height"
         android:layout_alignParentBottom="true"
-        android:visibility="gone">
+        android:visibility="invisible">
 
         <androidx.recyclerview.widget.RecyclerView
             android:id="@+id/photo_portrait_stripe"