Description

As noted in #29739, there is an undesirable quirk with the current implementation of the Table of Contents block:

When a Table of Contents block is present, every letter typed in a Heading block counts as a separate undo step, in contrast to the default behavior of multiple letters typed in sequence being combined into a single undo step. This only affects typing in Heading blocks; other blocks continue to behave as expected, with whole strings of sequentially typed text counted as a single undo step as expected.

Unfortunately, I am not aware of any way to fix this, so I could use some expert technical help here.

Step-by-step reproduction instructions

1. Insert a Table of Contents block.
2. Insert a Heading block.
3. Type "Hello world" into the Heading block.
4. Click the "Undo" button in the main toolbar of the editor.
5. Notice that each undo step removes a single character, instead of the entire sequence of typed text.

Screenshots, screen recording, code snippet

No response

Environment info

• WP 6.0-alpha-52828
• Gutenberg trunk as of ff56d57

Please confirm that you have searched existing issues in the repo.

Yes

Please confirm that you have tested with all plugins deactivated except Gutenberg.

Yes