dsiable scrolling on appbar if no tabs where added to media fragment

fixes #33

app/src/main/java/org/mosad/teapod/ui/activity/main/fragments/MediaFragment.kt

@@ -13,6 +13,7 @@ import androidx.fragment.app.activityViewModels
 import androidx.viewpager2.adapter.FragmentStateAdapter
 import com.bumptech.glide.Glide
 import com.bumptech.glide.request.RequestOptions
+import com.google.android.material.appbar.AppBarLayout
 import com.google.android.material.tabs.TabLayoutMediator
 import jp.wasabeef.glide.transformations.BlurTransformation
 import kotlinx.coroutines.*
@@ -23,6 +24,7 @@ import org.mosad.teapod.ui.activity.main.viewmodel.MediaFragmentViewModel
 import org.mosad.teapod.util.*
 import org.mosad.teapod.util.DataTypes.MediaType
 
+
 /**
  * The media detail fragment.
  * Note: the fragment is created only once, when selecting a similar title etc.
@@ -147,6 +149,12 @@ class MediaFragment(private val mediaId: Int) : Fragment() {
             pagerAdapter.notifyDataSetChanged()
         }
 
+        // disable scrolling on appbar, if no tabs where added
+        if(fragments.isEmpty()) {
+            val params = binding.linearMedia.layoutParams as AppBarLayout.LayoutParams
+            params.scrollFlags = 0 // clear all scroll flags
+        }
+
         binding.frameLoading.visibility = View.GONE // hide loading indicator
     }