#4708 – Forbid merging cyclic sequences on delete in Sequence mode

epam · Jun 6, 2024 · 24fa531 · 24fa531
1 parent d86e93f
commit 24fa531
Showing 1 changed file with 16 additions and 0 deletions.
diff --git a/packages/ketcher-core/src/application/editor/modes/SequenceMode.ts b/packages/ketcher-core/src/application/editor/modes/SequenceMode.ts
@@ -610,6 +610,22 @@ export class SequenceMode extends BaseMode {
         direction === Direction.Left
           ? SequenceRenderer.previousNode
           : SequenceRenderer.getNodeByPointer(SequenceRenderer.caretPosition);
+
+      if (
+        !this.areR1R2Free(
+          SequenceRenderer.nextNode,
+          SequenceRenderer.previousNode,
+        )
+      ) {
+        editor.events.openErrorModal.dispatch({
+          errorTitle: 'Error Message',
+          errorMessage:
+            'It is impossible to merge fragments. Attachment point to establish bonds are not available.',
+        });
+
+        return;
+      }
+
       const caretPosition =
         direction === Direction.Left
           ? (SequenceRenderer.previousCaretPosition as number)