Fix #857: Clear in-memory cache as well as on disk

backend/app.go

@@ -283,6 +283,7 @@ func (a *App) ClearCaches() {
 			}
 		}
 	}
+	a.ImageManager.ClearInMemoryCache()
 }
 
 func checkPortablePath() string {

backend/imagemanager.go

@@ -66,10 +66,7 @@ func NewImageManager(ctx context.Context, s *ServerManager, baseCacheDir string)
 		maxOnDiskCacheSizeBytes: defaultDiskCacheSizeBytes,
 		serverFetchSema:         make(chan any, maxConcurrentServerFetches),
 	}
-	s.OnLogout(func() {
-		i.thumbnailCache.Clear()
-		i.clearFullSizeCover()
-	})
+	s.OnLogout(i.ClearInMemoryCache)
 	i.thumbnailCache.OnEvictTaskRan = func() {
 		i.clearFullSizeCoverIfExpired()
 		i.pruneOnDiskCache()
@@ -195,6 +192,12 @@ func (i *ImageManager) RefreshCachedArtistImageIfExpired(artistID string, imgURL
 	return err
 }
 
+// ClearInMemoryCache clears images from the in-memory caches.
+func (i *ImageManager) ClearInMemoryCache() {
+	i.thumbnailCache.Clear()
+	i.clearFullSizeCover()
+}
+
 func (i *ImageManager) ensureCoverCacheDir() string {
 	// if user logged out with pending fetches in progress,
 	// make sure we don't write to nil (00000000-*0) cache directory