Bug/2894 covers not updating (#2908)

* Use a wrapper around Manga to supply glide with proper equals() and hashCode() impl. for caching

* reload image if url has changed

* ignore case for http scheme comparison

* more ignore case for http scheme comparison

* fix indenting

* use data class for MangaThumbnail

app/src/main/java/eu/kanade/tachiyomi/ui/migration/MangaHolder.kt

@@ -4,6 +4,7 @@ import android.view.View
 import com.bumptech.glide.load.engine.DiskCacheStrategy
 import eu.davidea.flexibleadapter.FlexibleAdapter
 import eu.kanade.tachiyomi.data.glide.GlideApp
+import eu.kanade.tachiyomi.data.glide.toMangaThumbnail
 import eu.kanade.tachiyomi.ui.base.holder.BaseFlexibleViewHolder
 import kotlinx.android.synthetic.main.source_list_item.thumbnail
 import kotlinx.android.synthetic.main.source_list_item.title
@@ -26,7 +27,7 @@ class MangaHolder(
         // Update the cover.
         GlideApp.with(itemView.context).clear(thumbnail)
         GlideApp.with(itemView.context)
-                .load(item.manga)
+                .load(item.manga.toMangaThumbnail())
                 .diskCacheStrategy(DiskCacheStrategy.RESOURCE)
                 .centerCrop()
                 .circleCrop()