Fix a bug in nextcloud: when click select all, the button select files is still disabled

packages/file-handling/src/dbp-nextcloud-file-picker.js

@@ -926,6 +926,7 @@ export class NextcloudFilePicker extends ScopedElementsMixin(DBPLitElement) {
         this.tabulatorTable.selectRow(this.tabulatorTable.getRows().filter(row => row.getData().type != 'directory' && this.checkFileType(row.getData(), this.allowedMimeTypes)));
         if (this.tabulatorTable.getSelectedRows().length > 0) {
             this.selectAllButton = false;
+            this.isSelected = true;
         }
     }