Bug: SELECTION_CHANGE_COMMAND is not triggered if the anchor and focus are on nodes of the same type

Lexical version: 0.51.0

Steps To Reproduce

1. Select a part of the text such that the anchor node and the focus node are located on an unformatted TextNode
2. Press Backspace

Link to code example

The current behavior

SELECTION_CHANGE_COMMAND is not triggered in any browser. Note, however, that the command is dispatched if the selection boundary is located on a formatted text node or inside an inline node

https://github.com/user-attachments/assets/3cff8057-5c8f-4361-ab54-6dc039b198f0

It has also been locally confirmed that the bug reproduces on version 0.50.0

The expected behavior

SELECTION_CHANGE_COMMAND is dispatched if a selection with boundaries is removed from any type of node

Impact of fix

Handlers tied to selection changes via a Lexical command do not receive the event, even though the selection has actually changed. Despite the specific conditions required to reproduce the bug, it appears that it may occur quite frequently