From c116faada8dd0ac7604be79633accb6d93347bd7 Mon Sep 17 00:00:00 2001
From: Bill Leoutsakos <billleoutsakos@Bills-MacBook-Pro.local>
Date: Thu, 24 Sep 2026 11:36:46 -0700
Subject: [PATCH 1/2] Scope preview workflow cursors to each instance

---
 .../preview-workflow-cursor.test.tsx          | 139 ++++++++++++++++++
 .../preview-workflow/preview-workflow.css     |  27 ++++
 .../preview-workflow/preview-workflow.tsx     |  39 ++---
 3 files changed, 177 insertions(+), 28 deletions(-)
 create mode 100644 apps/sim/app/workspace/[workspaceId]/w/components/preview/components/preview-workflow/preview-workflow-cursor.test.tsx
 create mode 100644 apps/sim/app/workspace/[workspaceId]/w/components/preview/components/preview-workflow/preview-workflow.css

diff --git a/apps/sim/app/workspace/[workspaceId]/w/components/preview/components/preview-workflow/preview-workflow-cursor.test.tsx b/apps/sim/app/workspace/[workspaceId]/w/components/preview/components/preview-workflow/preview-workflow-cursor.test.tsx
new file mode 100644
index 00000000000..59c82f42678
--- /dev/null
+++ b/apps/sim/app/workspace/[workspaceId]/w/components/preview/components/preview-workflow/preview-workflow-cursor.test.tsx
@@ -0,0 +1,139 @@
+/**
+ * @vitest-environment jsdom
+ */
+
+import { act, type ReactNode } from 'react'
+import { createRoot } from 'react-dom/client'
+import { afterEach, describe, expect, it, vi } from 'vitest'
+import type { WorkflowState } from '@/stores/workflows/workflow/types'
+
+vi.mock('@xyflow/react', () => ({
+  ConnectionLineType: { SmoothStep: 'smoothstep' },
+  ReactFlowProvider: ({ children }: { children: ReactNode }) => children,
+  ReactFlow: () => (
+    <div className='react-flow'>
+      <div className='react-flow__pane' />
+      <div className='react-flow__selectionpane' />
+      <div className='react-flow__renderer'>
+        <div className='react-flow__node'>Node</div>
+      </div>
+    </div>
+  ),
+  useReactFlow: () => ({ fitView: vi.fn() }),
+}))
+
+vi.mock('next/navigation', () => ({ useParams: () => ({ workspaceId: 'workspace-1' }) }))
+vi.mock('@/hooks/queries/workflows', () => ({
+  useWorkflowMap: () => ({ data: {}, isSuccess: true, isPlaceholderData: false }),
+}))
+vi.mock('@sim/workflow-renderer', () => ({
+  BLOCK_DIMENSIONS: { FIXED_WIDTH: 200, MIN_HEIGHT: 100 },
+  BLOCK_Z_BASE: 1,
+  CANVAS_Z_INDEX_MODE: 'manual',
+  CONTAINER_CHILD_Z_BASE: 2,
+  CONTAINER_DIMENSIONS: {
+    MIN_WIDTH: 200,
+    MIN_HEIGHT: 100,
+    DEFAULT_WIDTH: 200,
+    DEFAULT_HEIGHT: 100,
+  },
+  EDGE_Z_BASE: 0,
+  EDGE_Z_MAX: 10,
+  getEdgeZIndexForTarget: () => 0,
+  sortNodesParentsFirst: (nodes: unknown[]) => nodes,
+  useCanvasColorMode: () => 'light',
+}))
+vi.mock('@sim/workflow-types/workflow', () => ({
+  normalizeWorkflowEdgeHandles: (edges: unknown[]) => edges,
+}))
+vi.mock(
+  '@/app/workspace/[workspaceId]/w/[workflowId]/components/workflow-edge/workflow-edge',
+  () => ({
+    WorkflowEdge: () => null,
+  })
+)
+vi.mock('@/app/workspace/[workspaceId]/w/[workflowId]/utils', () => ({
+  estimateBlockDimensions: () => ({ width: 200, height: 100 }),
+  SUBFLOW_CHILD_NODE_CLASS: 'subflow-child',
+}))
+vi.mock(
+  '@/app/workspace/[workspaceId]/w/components/preview/components/preview-workflow/components/block',
+  () => ({
+    PreviewBlock: () => null,
+  })
+)
+vi.mock(
+  '@/app/workspace/[workspaceId]/w/components/preview/components/preview-workflow/components/subflow',
+  () => ({
+    PreviewSubflow: () => null,
+  })
+)
+
+import { PreviewWorkflow } from '@/app/workspace/[workspaceId]/w/components/preview/components/preview-workflow/preview-workflow'
+
+const workflowState = { blocks: {}, edges: [] } as WorkflowState
+let host: HTMLDivElement | undefined
+let root: ReturnType<typeof createRoot> | undefined
+
+afterEach(() => {
+  if (root) act(() => root?.unmount())
+  host?.remove()
+  root = undefined
+  host = undefined
+  vi.unstubAllGlobals()
+})
+
+describe('PreviewWorkflow cursors', () => {
+  it('keeps two mounted previews independent when either cursor changes', () => {
+    vi.stubGlobal(
+      'ResizeObserver',
+      class {
+        observe() {}
+        disconnect() {}
+      }
+    )
+    host = document.createElement('div')
+    document.body.appendChild(host)
+    root = createRoot(host)
+
+    act(() =>
+      root?.render(
+        <>
+          <PreviewWorkflow workflowState={workflowState} cursorStyle='grab' />
+          <PreviewWorkflow
+            workflowState={workflowState}
+            cursorStyle='pointer'
+            onNodeClick={() => {}}
+          />
+        </>
+      )
+    )
+
+    const previews = host.querySelectorAll<HTMLElement>('.preview-mode')
+    expect(previews).toHaveLength(2)
+    expect(previews[0].style.getPropertyValue('--preview-cursor')).toBe('grab')
+    expect(previews[0]).toHaveAttribute('data-preview-grab')
+    expect(previews[1].style.getPropertyValue('--preview-cursor')).toBe('pointer')
+    expect(previews[1]).not.toHaveAttribute('data-preview-grab')
+    expect(previews[1]).toHaveClass('interactive-nodes')
+
+    act(() =>
+      root?.render(
+        <>
+          <PreviewWorkflow workflowState={workflowState} cursorStyle='default' />
+          <PreviewWorkflow
+            workflowState={workflowState}
+            cursorStyle='grab'
+            onNodeClick={() => {}}
+          />
+        </>
+      )
+    )
+
+    expect(previews[0].style.getPropertyValue('--preview-cursor')).toBe('default')
+    expect(previews[0]).not.toHaveAttribute('data-preview-grab')
+    expect(previews[1].style.getPropertyValue('--preview-cursor')).toBe('grab')
+    expect(previews[1]).toHaveAttribute('data-preview-grab')
+    expect(previews[1]).toHaveClass('interactive-nodes')
+  })
+})
diff --git a/apps/sim/app/workspace/[workspaceId]/w/components/preview/components/preview-workflow/preview-workflow.css b/apps/sim/app/workspace/[workspaceId]/w/components/preview/components/preview-workflow/preview-workflow.css
new file mode 100644
index 00000000000..fa7f7f69ce9
--- /dev/null
+++ b/apps/sim/app/workspace/[workspaceId]/w/components/preview/components/preview-workflow/preview-workflow.css
@@ -0,0 +1,27 @@
+.preview-mode .react-flow,
+.preview-mode .react-flow__renderer {
+  cursor: var(--preview-cursor);
+}
+
+.preview-mode .react-flow__pane,
+.preview-mode .react-flow__selectionpane {
+  cursor: var(--preview-cursor) !important;
+}
+
+.preview-mode:where([data-preview-grab]) .react-flow:active,
+.preview-mode:where([data-preview-grab]) .react-flow__renderer:active {
+  cursor: grabbing;
+}
+
+.preview-mode:where([data-preview-grab]) .react-flow__pane:active,
+.preview-mode:where([data-preview-grab]) .react-flow__selectionpane:active,
+.preview-mode:where([data-preview-grab]) .react-flow__node:active,
+.preview-mode:where([data-preview-grab]) .react-flow__node:active * {
+  cursor: grabbing !important;
+}
+
+.preview-mode.interactive-nodes .react-flow__node,
+.preview-mode.interactive-nodes .react-flow__node > div,
+.preview-mode.interactive-nodes .react-flow__node * {
+  cursor: pointer !important;
+}
diff --git a/apps/sim/app/workspace/[workspaceId]/w/components/preview/components/preview-workflow/preview-workflow.tsx b/apps/sim/app/workspace/[workspaceId]/w/components/preview/components/preview-workflow/preview-workflow.tsx
index cdadfef7750..a4c175a64eb 100644
--- a/apps/sim/app/workspace/[workspaceId]/w/components/preview/components/preview-workflow/preview-workflow.tsx
+++ b/apps/sim/app/workspace/[workspaceId]/w/components/preview/components/preview-workflow/preview-workflow.tsx
@@ -1,6 +1,6 @@
 'use client'
 
-import { useEffect, useMemo, useRef } from 'react'
+import { type CSSProperties, useEffect, useMemo, useRef } from 'react'
 import {
   ConnectionLineType,
   type Edge,
@@ -38,6 +38,7 @@ import { PreviewBlock } from '@/app/workspace/[workspaceId]/w/components/preview
 import { PreviewSubflow } from '@/app/workspace/[workspaceId]/w/components/preview/components/preview-workflow/components/subflow'
 import { useWorkflowMap } from '@/hooks/queries/workflows'
 import type { BlockState, WorkflowState } from '@/stores/workflows/workflow/types'
+import '@/app/workspace/[workspaceId]/w/components/preview/components/preview-workflow/preview-workflow.css'
 
 const logger = createLogger('PreviewWorkflow')
 
@@ -627,35 +628,17 @@ export function PreviewWorkflow({
     <ReactFlowProvider>
       <div
         ref={containerRef}
-        style={{ height, width, backgroundColor: 'var(--bg)' }}
+        style={
+          {
+            height,
+            width,
+            backgroundColor: 'var(--bg)',
+            '--preview-cursor': cursorStyle,
+          } as CSSProperties
+        }
         className={cn('preview-mode', onNodeClick && 'interactive-nodes', className)}
+        data-preview-grab={cursorStyle === 'grab' ? '' : undefined}
       >
-        <style>{`
-          /* Canvas cursor - grab on the flow container and pane */
-          .preview-mode .react-flow { cursor: ${cursorStyle}; }
-          .preview-mode .react-flow__pane { cursor: ${cursorStyle} !important; }
-          .preview-mode .react-flow__selectionpane { cursor: ${cursorStyle} !important; }
-          .preview-mode .react-flow__renderer { cursor: ${cursorStyle}; }
-
-          /* Active/grabbing cursor when dragging */
-          ${
-            cursorStyle === 'grab'
-              ? `
-          .preview-mode .react-flow:active { cursor: grabbing; }
-          .preview-mode .react-flow__pane:active { cursor: grabbing !important; }
-          .preview-mode .react-flow__selectionpane:active { cursor: grabbing !important; }
-          .preview-mode .react-flow__renderer:active { cursor: grabbing; }
-          .preview-mode .react-flow__node:active { cursor: grabbing !important; }
-          .preview-mode .react-flow__node:active * { cursor: grabbing !important; }
-          `
-              : ''
-          }
-
-          /* Node cursor - pointer on nodes when onNodeClick is provided */
-          .preview-mode.interactive-nodes .react-flow__node { cursor: pointer !important; }
-          .preview-mode.interactive-nodes .react-flow__node > div { cursor: pointer !important; }
-          .preview-mode.interactive-nodes .react-flow__node * { cursor: pointer !important; }
-        `}</style>
         <ReactFlow
           colorMode={colorMode}
           zIndexMode={CANVAS_Z_INDEX_MODE}

From 2755d3c24033a87588a8a1cde9861b56e58252e3 Mon Sep 17 00:00:00 2001
From: Bill Leoutsakos <billleoutsakos@Bills-MacBook-Pro.local>
Date: Thu, 24 Sep 2026 12:18:37 -0700
Subject: [PATCH 2/2] test(preview): verify scoped cursor CSS across mounted
 previews

---
 .../preview-workflow-cursor.test.tsx          | 68 +++++++++++++++++++
 1 file changed, 68 insertions(+)

diff --git a/apps/sim/app/workspace/[workspaceId]/w/components/preview/components/preview-workflow/preview-workflow-cursor.test.tsx b/apps/sim/app/workspace/[workspaceId]/w/components/preview/components/preview-workflow/preview-workflow-cursor.test.tsx
index 59c82f42678..b84520a72cf 100644
--- a/apps/sim/app/workspace/[workspaceId]/w/components/preview/components/preview-workflow/preview-workflow-cursor.test.tsx
+++ b/apps/sim/app/workspace/[workspaceId]/w/components/preview/components/preview-workflow/preview-workflow-cursor.test.tsx
@@ -2,6 +2,7 @@
  * @vitest-environment jsdom
  */
 
+import { readFileSync } from 'node:fs'
 import { act, type ReactNode } from 'react'
 import { createRoot } from 'react-dom/client'
 import { afterEach, describe, expect, it, vi } from 'vitest'
@@ -74,12 +75,15 @@ import { PreviewWorkflow } from '@/app/workspace/[workspaceId]/w/components/prev
 const workflowState = { blocks: {}, edges: [] } as WorkflowState
 let host: HTMLDivElement | undefined
 let root: ReturnType<typeof createRoot> | undefined
+let cursorStyles: HTMLStyleElement | undefined
 
 afterEach(() => {
   if (root) act(() => root?.unmount())
   host?.remove()
+  cursorStyles?.remove()
   root = undefined
   host = undefined
+  cursorStyles = undefined
   vi.unstubAllGlobals()
 })
 
@@ -136,4 +140,68 @@ describe('PreviewWorkflow cursors', () => {
     expect(previews[1]).toHaveAttribute('data-preview-grab')
     expect(previews[1]).toHaveClass('interactive-nodes')
   })
+
+  it('applies the production cursor CSS only within each mounted preview', () => {
+    vi.stubGlobal(
+      'ResizeObserver',
+      class {
+        observe() {}
+        disconnect() {}
+      }
+    )
+
+    // JSDOM computes stylesheet rules but cannot keep an element in :active after
+    // a pointer event. Map that pseudo-class to an attribute for this CSS test.
+    cursorStyles = document.createElement('style')
+    cursorStyles.textContent = readFileSync(
+      'app/workspace/[workspaceId]/w/components/preview/components/preview-workflow/preview-workflow.css',
+      'utf8'
+    ).replaceAll(':active', '[data-test-active]')
+    document.head.appendChild(cursorStyles)
+
+    host = document.createElement('div')
+    document.body.appendChild(host)
+    root = createRoot(host)
+
+    const render = (first: 'grab' | 'default', second: 'grab' | 'pointer') =>
+      act(() =>
+        root?.render(
+          <>
+            <PreviewWorkflow workflowState={workflowState} cursorStyle={first} />
+            <PreviewWorkflow
+              workflowState={workflowState}
+              cursorStyle={second}
+              onNodeClick={() => {}}
+            />
+          </>
+        )
+      )
+
+    render('grab', 'pointer')
+
+    const previews = host.querySelectorAll<HTMLElement>('.preview-mode')
+    expect(previews).toHaveLength(2)
+    const panes = Array.from(
+      previews,
+      (preview) => preview.querySelector<HTMLElement>('.react-flow__pane')!
+    )
+    const nodes = Array.from(
+      previews,
+      (preview) => preview.querySelector<HTMLElement>('.react-flow__node')!
+    )
+
+    for (const element of [...panes, ...nodes]) element.setAttribute('data-test-active', '')
+
+    expect(getComputedStyle(panes[0]).cursor).toBe('grabbing')
+    expect(getComputedStyle(nodes[0]).cursor).toBe('grabbing')
+    expect(getComputedStyle(panes[1]).cursor).toBe('var(--preview-cursor)')
+    expect(getComputedStyle(nodes[1]).cursor).toBe('pointer')
+
+    render('default', 'grab')
+
+    expect(getComputedStyle(panes[0]).cursor).toBe('var(--preview-cursor)')
+    expect(getComputedStyle(nodes[0]).cursor).not.toBe('grabbing')
+    expect(getComputedStyle(panes[1]).cursor).toBe('grabbing')
+    expect(getComputedStyle(nodes[1]).cursor).toBe('pointer')
+  })
 })