search function for show editing

src/app/modules/shows/show/show.component.html

@@ -21,7 +21,10 @@
       <mat-form-field appearance="outline">
         <mat-label>Lied hinzufügen...</mat-label>
         <mat-select (selectionChange)="onAddSongSelectionChanged($event)">
-          <mat-option *ngFor="let song of songs" [value]="song.id">{{song.title}}</mat-option>
+          <mat-option>
+            <ngx-mat-select-search [formControl]="filteredSongsControl"></ngx-mat-select-search>
+          </mat-option>
+          <mat-option *ngFor="let song of filteredSongs()" [value]="song.id">{{song.title}}</mat-option>
         </mat-select>
       </mat-form-field>