#4977 - System doesn't show side chain bonds if chain loaded directly…

… to Snake-mode canvas

- added snake layout operation after opening file if snake mode turned on

packages/ketcher-macromolecules/src/components/modal/Open/Open.tsx

@@ -27,6 +27,8 @@ import {
   EditorHistory,
   SequenceMode,
   macromoleculesFilesInputFormats,
+  ModeTypes,
+  SnakeMode,
 } from 'ketcher-core';
 import { IndigoProvider } from 'ketcher-react';
 import { RequiredModalProps } from '../modalContainer';
@@ -137,14 +139,23 @@ const addToCanvas = ({
     );
   const editorHistory = new EditorHistory(editor);
   const isSequenceMode = editor.mode instanceof SequenceMode;
+  const isSnakeMode = editor.mode instanceof SnakeMode;
 
   editor.renderersContainer.update(modelChanges);
   editorHistory.update(modelChanges);
 
   if (isSequenceMode) {
     modelChanges.setUndoOperationReverse();
     editor.events.selectMode.dispatch({
-      mode: 'sequence-layout-mode',
+      mode: ModeTypes.sequence,
+      mergeWithLatestHistoryCommand: true,
+    });
+  }
+
+  if (isSnakeMode) {
+    modelChanges.setUndoOperationReverse();
+    editor.events.selectMode.dispatch({
+      mode: ModeTypes.snake,
       mergeWithLatestHistoryCommand: true,
     });
   }