Using extension icon instead of letter for catalogues (closes #2261)

app/src/main/java/eu/kanade/tachiyomi/extension/ExtensionManager.kt

@@ -1,6 +1,7 @@
 package eu.kanade.tachiyomi.extension
 
 import android.content.Context
+import android.graphics.drawable.Drawable
 import com.jakewharton.rxrelay.BehaviorRelay
 import eu.kanade.tachiyomi.data.preference.PreferencesHelper
 import eu.kanade.tachiyomi.data.preference.getOrDefault
@@ -11,6 +12,7 @@ import eu.kanade.tachiyomi.extension.model.LoadResult
 import eu.kanade.tachiyomi.extension.util.ExtensionInstallReceiver
 import eu.kanade.tachiyomi.extension.util.ExtensionInstaller
 import eu.kanade.tachiyomi.extension.util.ExtensionLoader
+import eu.kanade.tachiyomi.source.Source
 import eu.kanade.tachiyomi.source.SourceManager
 import eu.kanade.tachiyomi.util.lang.launchNow
 import kotlinx.coroutines.async
@@ -57,6 +59,12 @@ class ExtensionManager(
             installedExtensionsRelay.call(value)
         }
 
+    fun getAppIconForSource(source: Source): Drawable? {
+        val pkgName = installedExtensions.find { ext -> ext.sources.any { it.id == source.id } }?.pkgName
+        return if (pkgName != null) context.packageManager.getApplicationIcon(pkgName)
+        else null
+    }
+
     /**
      * Relay used to notify the available extensions.
      */