Christian Byrne 5224c63bce [fix] Prevent incompatible connections to SubgraphInputNode occupied slots (#4984) ...

## Summary

This PR fixes #4681 by building upon the foundation laid in PR #1182
(litegraph.js). It prevents incompatible type connections when dragging
from a normal node's output to a SubgraphInputNode's occupied slot.

Before:


https://github.com/user-attachments/assets/03def938-dccc-4b2c-b65b-745abf02a13b

After:


https://github.com/user-attachments/assets/7a0a2ed4-9ecd-4147-be56-d643d448d4cb

## Background

PR #1182 implemented:
- `isValidTarget()` method in SubgraphInput/SubgraphOutput classes for
validation
- Visual feedback during drag (40% opacity for invalid targets)
- Validation at the slot level

However, there was a missing piece: while the visual feedback correctly
showed invalid targets, the actual connection would still be made when
dropped.

## Changes

This PR extends PR #1182 by adding the missing connection prevention:

1. **Added `canConnectToSubgraphInput()` method** to render link
classes:
   - `MovingOutputLink`
   - `ToOutputRenderLink`
   - `FloatingRenderLink`
- All methods use the existing `SubgraphInput.isValidTarget()` from PR
#1182

2. **Added validation in `LinkConnector.dropOnIoNode()`**:
   - Checks `canConnectToSubgraphInput()` before allowing the connection
   - Logs a warning when rejecting invalid connections
   - Follows the same pattern as regular node connections

3. **Added `isSubgraphInputValidDrop()` method**:
   - Provides validation for hover states
   - Ensures consistent validation across the UI

2025-08-14 12:51:43 -07:00

..

litegraph

[fix] Prevent incompatible connections to SubgraphInputNode occupied slots (#4984)

2025-08-14 12:51:43 -07:00