Enter no longer creates sibling toggles when parent is expanded

Description:

I've noticed a regression in the keyboard behaviour of toggle blocks that previously worked correctly approximately five major updates ago.

Steps to reproduce:

Create a parent toggle using >f.

Press Ctrl + Enter to create a nested toggle beneath it.

Return to the parent toggle while keeping it expanded.

Press Enter.

Current behaviour:

Enter creates a new nested toggle beneath the parent rather than a sibling toggle at the same indentation level.

Previous / Expected behaviour:

Previously, pressing Enter while editing the parent toggle created a new sibling toggle at the parent's indentation level, even when the parent was expanded.

Ctrl + Enter was used to deliberately create nested content.

Video Evidence:

I've attached a screen recording demonstrating the issue.

The recording shows how pressing Enter while editing an expanded parent toggle incorrectly creates a nested toggle instead of a sibling toggle.

This behaviour previously worked as expected approximately five major updates ago, so I believe this is a regression rather than an intentional design choice.

Recording 2026-10-26 192444.mp4

capacities-diagnostics.txt

Capacities v1.72.4; none none; Windows v10; Chrome v148.0.7778.280 (WebKit v537.36); Desktop (Electron); 26/10/2026, 19:26:42