fix #1765, properly handle videos at slideshows

app/src/main/kotlin/com/simplemobiletools/gallery/pro/activities/PhotoVideoActivity.kt

@@ -359,4 +359,6 @@ open class PhotoVideoActivity : SimpleActivity(), ViewPagerFragment.FragmentList
     override fun goToNextItem() {}
 
     override fun launchViewVideoIntent(path: String) {}
+
+    override fun isSlideShowActive() = false
 }

app/src/main/kotlin/com/simplemobiletools/gallery/pro/activities/ViewPagerActivity.kt

@@ -1185,6 +1185,8 @@ class ViewPagerActivity : SimpleActivity(), ViewPager.OnPageChangeListener, View
         return mIsSlideshowActive
     }
 
+    override fun isSlideShowActive() = mIsSlideshowActive
+
     override fun goToPrevItem() {
         view_pager.setCurrentItem(view_pager.currentItem - 1, false)
         checkOrientation()

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

@@ -347,7 +347,7 @@ class VideoFragment : ViewPagerFragment(), TextureView.SurfaceTextureListener, S
 
         mExoPlayer = ExoPlayerFactory.newSimpleInstance(context)
         mExoPlayer!!.seekParameters = SeekParameters.CLOSEST_SYNC
-        if (mConfig.loopVideos) {
+        if (mConfig.loopVideos && listener?.isSlideShowActive() == false) {
             mExoPlayer?.repeatMode = Player.REPEAT_MODE_ONE
         }
 
@@ -722,10 +722,14 @@ class VideoFragment : ViewPagerFragment(), TextureView.SurfaceTextureListener, S
         }
 
         mCurrTime = (mExoPlayer!!.duration / 1000).toInt()
+        if (listener?.videoEnded() == false && mConfig.loopVideos) {
+            playVideo()
+        } else {
             mSeekBar.progress = mSeekBar.max
             mCurrTimeView.text = mDuration.getFormattedDuration()
             pauseVideo()
         }
+    }
 
     private fun cleanup() {
         pauseVideo()

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

@@ -31,6 +31,8 @@ abstract class ViewPagerFragment : Fragment() {
         fun goToNextItem()
 
         fun launchViewVideoIntent(path: String)
+
+        fun isSlideShowActive(): Boolean
     }
 
     fun getMediumExtendedDetails(medium: Medium): String {