Add duplicate song warning. Fix #554

* duplicate_song_warning added

* dialog_for_multiple_songs

* skip button updated

* duplicate_song_skip import removed

* duplicate_song msg updated

* handleSkip and checkDuplicateSong func modified

* Update AddToPlaylistDialog.js

* prettier applied

* go.sum file added

* duplicated songs bug fixed

ui/src/reducers/dialogReducer.js

@@ -1,8 +1,14 @@
-import { ADD_TO_PLAYLIST_CLOSE, ADD_TO_PLAYLIST_OPEN } from '../actions'
+import {
+  ADD_TO_PLAYLIST_CLOSE,
+  ADD_TO_PLAYLIST_OPEN,
+  DUPLICATE_SONG_WARNING_OPEN,
+  DUPLICATE_SONG_WARNING_CLOSE,
+} from '../actions'
 
 export const addToPlaylistDialogReducer = (
   previousState = {
     open: false,
+    duplicateSong: false,
   },
   payload
 ) => {
@@ -17,6 +23,14 @@ export const addToPlaylistDialogReducer = (
       }
     case ADD_TO_PLAYLIST_CLOSE:
       return { ...previousState, open: false, onSuccess: undefined }
+    case DUPLICATE_SONG_WARNING_OPEN:
+      return {
+        ...previousState,
+        duplicateSong: true,
+        duplicateIds: payload.duplicateIds,
+      }
+    case DUPLICATE_SONG_WARNING_CLOSE:
+      return { ...previousState, duplicateSong: false }
     default:
       return previousState
   }