feat(copy-paste): allow cross workflow selection, paste, move for blocks

[icecrasher321]

Summary

• Copy/Paste using cmd-c and cmd-v
• Can select sections of blocks using shift + drag
• Refactor sockets and undo/redo to use batch update funcs for duplication, add, remove, update position.
• Remove legacy duplicate variable event handlers

Type of Change

• New feature

Testing

Tested manually

Checklist

• Code follows project style guidelines
• Self-reviewed my changes
• Tests added/updated and passing
• No new warnings introduced
• I confirm that I have read and agree to the terms outlined in the Contributor License Agreement (CLA)

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1 Skipped Deployment

Project	Deployment	Review	Updated (UTC)
docs	Skipped		Dec 31, 2025 10:41am

[greptile-apps]

Greptile Summary

This PR implements cross-workflow copy/paste functionality for blocks using Cmd+C and Cmd+V keyboard shortcuts. The implementation refactors the codebase to use batch operations (batch-add-blocks and batch-remove-blocks) instead of individual block operations, improving performance and enabling atomic multi-block operations.

Key Changes:

• Added clipboard management in WorkflowRegistry with copyBlocks(), preparePasteData(), and hasClipboard() methods
• Implemented regenerateBlockIds() utility to handle ID regeneration, name uniquification, and reference updates during paste
• Refactored socket operations to support batch operations with proper validation schemas and permission checks
• Updated undo/redo system to record batch operations with proper inverse operations
• Integrated keyboard shortcuts (Cmd+C/Cmd+V) in the workflow canvas
• Removed legacy duplicate event handlers and cleaned up code

Architecture Improvements:

• Batch operations are atomic, improving consistency
• Direct state updates for loops/parallels in collaborativeBatchAddBlocks() bypass individual store methods for efficiency
• Parent subflow node lists are collected before deletion to avoid race conditions

Confidence Score: 4/5

• This PR is generally safe to merge with solid architecture and comprehensive test coverage
• The implementation is well-structured with proper batch operations, undo/redo support, and permission handling. Tests have been updated to reflect the new batch operation patterns. The direct state updates for loops/parallels (line 1371-1380) are intentional for performance. The parent ID collection before deletion addresses potential race conditions. Code is production-ready with good attention to edge cases.
• No files require special attention - the implementation is solid across all modified files

Important Files Changed

Filename	Overview
apps/sim/stores/workflows/utils.ts	Added utility functions for block preparation, duplication, and ID regeneration for copy/paste functionality
apps/sim/hooks/use-collaborative-workflow.ts	Refactored to use batch operations (batch-add-blocks, batch-remove-blocks) replacing individual block operations
apps/sim/hooks/use-undo-redo.ts	Added batch operation recording for undo/redo with proper inverse operation handling
apps/sim/socket/database/operations.ts	Implemented batch-add-blocks and batch-remove-blocks database operations with proper subflow handling
apps/sim/stores/workflows/registry/store.ts	Added clipboard management functions (copyBlocks, preparePasteData, hasClipboard) for cross-workflow copy/paste
apps/sim/app/workspace/[workspaceId]/w/[workflowId]/workflow.tsx	Integrated keyboard shortcuts (Cmd+C/Cmd+V) and refactored to use batch operations instead of individual block adds

Sequence Diagram

sequenceDiagram
participant User
participant UI as workflow.tsx
participant Registry as WorkflowRegistry
participant Collab as useCollaborativeWorkflow
participant UndoRedo as useUndoRedo
participant Queue as OperationQueue
participant Socket as Socket Handler
participant DB as Database
Note over User,DB: Copy Operation (Cmd+C)
User->>UI: Press Cmd+C
UI->>Registry: copyBlocks(blockIds)
Registry->>Registry: Store blocks, edges, loops, parallels in clipboard
Note over Registry: Includes nested subflow nodes automatically
Note over User,DB: Paste Operation (Cmd+V)
User->>UI: Press Cmd+V
UI->>Registry: preparePasteData()
Registry->>Registry: regenerateBlockIds()
Note over Registry: Generate new IDs, update references,<br/>apply position offset
Registry-->>UI: {blocks, edges, loops, parallels, subBlockValues}
UI->>Collab: collaborativeBatchAddBlocks()
Note over Collab,DB: Batch Add Blocks Flow
Collab->>Queue: addToQueue(batch-add-blocks operation)
Collab->>Collab: Add blocks to local state
Collab->>Collab: Add edges, loops, parallels
Collab->>Collab: Apply subblock values
Collab->>UndoRedo: recordBatchAddBlocks()
UndoRedo->>UndoRedo: Create operation + inverse
UndoRedo->>UndoRedo: Push to undo stack
Queue->>Socket: emit('workflow-operation')
Socket->>Socket: Validate schema
Socket->>Socket: Check permissions
Socket->>DB: persistWorkflowOperation()
DB->>DB: Insert blocks in transaction
DB->>DB: Insert edges
DB->>DB: Insert subflows (loops/parallels)
DB-->>Socket: Success
Socket->>Socket: Broadcast to other clients
Socket-->>Queue: operation-confirmed
Note over User,DB: Undo Operation
User->>UI: Press Cmd+Z
UI->>UndoRedo: undo()
UndoRedo->>UndoRedo: Pop from undo stack
UndoRedo->>UndoRedo: Get inverse operation
Note over UndoRedo: inverse = batch-remove-blocks
UndoRedo->>Queue: addToQueue(batch-remove-blocks)
UndoRedo->>Collab: Remove blocks locally
Queue->>Socket: emit('workflow-operation')
Socket->>DB: Delete blocks, edges, subflows
Socket->>Socket: Broadcast to other clients

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[icecrasher321]

@greptile

[greptile-apps]

Additional Comments (2)

1. apps/sim/socket/middleware/permissions.test.ts, line 83-86 (link)

   style: Test description is outdated - read role now allows both update-position and batch-update-positions

2. apps/sim/socket/middleware/permissions.test.ts, line 263 (link)

   logic: Test uses old 'remove' operation that no longer exists - should use 'batch-remove-blocks'

_{24 files reviewed, 8 comments}

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[icecrasher321]

@greptile