[Feature Request] Attach Note blocks to individual Mind Map nodes in Edgeless Mode

[gynzh]

Description

I would like to attach or anchor a Note block to a specific Mind Map node in Edgeless Mode.

Currently, a Mind Map node and a Note block are separate canvas elements. A connector can visually link them, but it does not preserve their relative positions.

When the Mind Map is automatically rearranged, the node may move while the related Note block remains at its original position. As a result, the Note becomes separated from the node it explains.

Current behavior

1. Create a Mind Map in Edgeless Mode.
2. Place a Note block next to one of the Mind Map nodes.
3. Connect the node and the Note with a connector.
4. Add a new branch, edit node text, move a node, or change the Mind Map layout.
5. The Mind Map node moves, but the Note block stays in its original position.

The connector updates its line, but the Note does not follow the node.

Grouping the entire Mind Map and the Note also does not fully solve the problem, because the internal nodes of the Mind Map can still be rearranged independently.

Expected behavior

Users should be able to attach a Note block to a specific Mind Map node.

After attachment, the Note should keep a fixed relative position to that node when the node moves because of:

• Adding or deleting branches
• Editing or resizing node text
• Moving the node to another parent
• Expanding or collapsing branches
• Changing the Mind Map layout
• Automatic Mind Map re-layout
• Manually dragging the node

For example, the Note could preserve an offset such as:

Note.x = node.right + offsetX
Note.y = node.centerY + offsetY

Suggested interaction

One possible workflow:

1. Drag a Note block close to a Mind Map node.
2. AFFiNE displays an attachment indicator.
3. Drop the Note to attach it to the node.
4. The Note follows the node while preserving its relative offset.
5. Moving the Note updates the saved offset.
6. A context menu provides an option to detach the Note.

It would also be useful to define what happens when:

• The node is deleted
• The branch is collapsed
• The node is moved to another parent
• The Mind Map layout direction changes
• The Note or node is copied
• Undo and redo are used
• The document is edited collaboratively

When deleting the Mind Map node, AFFiNE could provide the following options:

• Detach the Note
• Delete the Note together with the node
• Cancel

Use case

I use AFFiNE to create technical learning notes and programming concept maps.

A Mind Map node usually contains a short concept name, while a nearby Note block contains:

• Detailed explanations
• Code examples
• Images
• Tables
• Warnings
• Related resources

For example, a Mind Map node named "Tool Definition" may have a Note block next to it containing Python code and a detailed explanation.

The Note conceptually belongs to that specific node. When the Mind Map is rearranged, the Note should continue to stay next to the same node.

This feature would be useful for:

• Technical knowledge maps
• Programming notes
• Architecture diagrams
• Research notes
• Educational materials
• Mind Maps with detailed annotations

Why existing features do not fully solve this

• Connector preserves a visual connection, but not the relative position.
• Group can move the whole Mind Map and Note together, but it cannot track an individual internal Mind Map node.
• Frame can move contained elements together, but it does not follow the internal automatic layout of a Mind Map.

This feature requires a node-level attachment relationship.

Environment

• AFFiNE version: [your version]
• Platform: [Desktop or Web]
• Operating system: [Windows, macOS, or Linux]
• Mode: Edgeless Mode

Additional information

I have attached a screenshot showing the desired relationship between Mind Map nodes and Note blocks.

I am not currently able to submit a pull request, but I would be happy to test an early implementation and provide additional feedback.