simstudioai · waleedlatif1 · Jun 11, 2026 · Jun 11, 2026
diff --git a/...m/app/workspace/[workspaceId]/w/[workflowId]/components/workflow-block/workflow-block.tsx b/...m/app/workspace/[workspaceId]/w/[workflowId]/components/workflow-block/workflow-block.tsx
@@ -30,6 +30,7 @@ import {
   isSubBlockFeatureEnabled,
   isSubBlockHidden,
   isSubBlockVisibleForMode,
+  isTriggerModeSubBlock,
   resolveDependencyValue,
 } from '@/lib/workflows/subblocks/visibility'
 import { useUserPermissionsContext } from '@/app/workspace/[workspaceId]/providers/workspace-permissions-provider'
@@ -539,14 +540,14 @@ export const WorkflowBlock = memo(function WorkflowBlock({
 
       if (effectiveTrigger) {
         const isValidTriggerSubblock = isPureTriggerBlock
-          ? block.mode === 'trigger' || !block.mode
-          : block.mode === 'trigger'
+          ? isTriggerModeSubBlock(block) || !block.mode
+          : isTriggerModeSubBlock(block)
 
         if (!isValidTriggerSubblock) {
           return false
         }
       } else {
-        if (block.mode === 'trigger') {
+        if (isTriggerModeSubBlock(block)) {
           return false
         }
       }

diff --git a/apps/sim/lib/workflows/autolayout/utils.test.ts b/apps/sim/lib/workflows/autolayout/utils.test.ts
@@ -1,13 +1,18 @@
 /**
  * @vitest-environment node
  */
-import { describe, expect, it, vi } from 'vitest'
+import { beforeEach, describe, expect, it, vi } from 'vitest'
 import { DEFAULT_VERTICAL_SPACING } from '@/lib/workflows/autolayout/constants'
-import { resolveNoteOverlaps } from '@/lib/workflows/autolayout/utils'
+import { getBlockMetrics, resolveNoteOverlaps } from '@/lib/workflows/autolayout/utils'
+import type { getBlock } from '@/blocks'
 import type { BlockState } from '@/stores/workflows/workflow/types'
 
+const { mockGetBlock } = vi.hoisted(() => ({
+  mockGetBlock: vi.fn(),
+}))
+
 vi.mock('@/blocks', () => ({
-  getBlock: () => null,
+  getBlock: mockGetBlock,
 }))
 
 function createBlock(
@@ -29,6 +34,10 @@ function createBlock(
   } as BlockState
 }
 
+beforeEach(() => {
+  mockGetBlock.mockReturnValue(null)
+})
+
 describe('resolveNoteOverlaps', () => {
   it('relocates a note that overlaps a laid-out block', () => {
     const blocks: Record<string, BlockState> = {
@@ -236,3 +245,73 @@ describe('resolveNoteOverlaps', () => {
     })
   })
 })
+
+describe('getBlockMetrics preview row estimation', () => {
+  /**
+   * Mirrors a block that spreads a trigger's subBlocks after its own,
+   * producing duplicate canonical pair entries with trigger/trigger-advanced
+   * modes (e.g. the Table block spreading the table_new_row trigger).
+   */
+  const tableLikeConfig = {
+    category: 'blocks',
+    subBlocks: [
+      { id: 'operation', title: 'Operation', type: 'dropdown' },
+      {
+        id: 'tableSelector',
+        title: 'Table',
+        type: 'table-selector',
+        mode: 'basic',
+        canonicalParamId: 'tableId',
+      },
+      {
+        id: 'manualTableId',
+        title: 'Table ID',
+        type: 'short-input',
+        mode: 'advanced',
+        canonicalParamId: 'tableId',
+      },
+      { id: 'data', title: 'Row Data (JSON)', type: 'code' },
+      {
+        id: 'tableSelector',
+        title: 'Table',
+        type: 'table-selector',
+        mode: 'trigger',
+        canonicalParamId: 'tableId',
+      },
+      {
+        id: 'manualTableId',
+        title: 'Table ID',
+        type: 'short-input',
+        mode: 'trigger-advanced',
+        canonicalParamId: 'tableId',
+      },
+      { id: 'eventType', title: 'Event', type: 'dropdown', mode: 'trigger' },
+    ],
+  } as unknown as ReturnType<typeof getBlock>
+
+  function createTableBlock(canonicalMode: 'basic' | 'advanced'): BlockState {
+    return {
+      id: 'table-1',
+      type: 'table',
+      name: 'Table 1',
+      position: { x: 0, y: 0 },
+      subBlocks: {
+        operation: { id: 'operation', type: 'dropdown', value: 'insert_row' },
+        tableSelector: { id: 'tableSelector', type: 'table-selector', value: 'tbl_1' },
+        manualTableId: { id: 'manualTableId', type: 'short-input', value: 'tbl_1' },
+      },
+      outputs: {},
+      enabled: true,
+      data: { canonicalModes: { tableId: canonicalMode } },
+    } as unknown as BlockState
+  }
+
+  it('renders one row per canonical pair regardless of basic/advanced mode', () => {
+    mockGetBlock.mockReturnValue(tableLikeConfig)
+
+    const basic = getBlockMetrics(createTableBlock('basic'))
+    const advanced = getBlockMetrics(createTableBlock('advanced'))
+
+    expect(advanced.height).toBe(basic.height)
+  })
+})
diff --git a/apps/sim/lib/workflows/autolayout/utils.ts b/apps/sim/lib/workflows/autolayout/utils.ts
@@ -20,6 +20,7 @@ import {
   isSubBlockFeatureEnabled,
   isSubBlockHidden,
   isSubBlockVisibleForMode,
+  isTriggerModeSubBlock,
 } from '@/lib/workflows/subblocks/visibility'
 import { getBlock } from '@/blocks'
 import type { BlockState } from '@/stores/workflows/workflow/types'
@@ -175,13 +176,13 @@ function getVisiblePreviewSubBlockCount(block: BlockState): number {
 
     if (effectiveTrigger) {
       const isValidTriggerSubblock = isPureTriggerBlock
-        ? subBlock.mode === 'trigger' || !subBlock.mode
-        : subBlock.mode === 'trigger'
+        ? isTriggerModeSubBlock(subBlock) || !subBlock.mode
+        : isTriggerModeSubBlock(subBlock)
 
       if (!isValidTriggerSubblock) {
         return false
       }
-    } else if (subBlock.mode === 'trigger') {
+    } else if (isTriggerModeSubBlock(subBlock)) {
       return false
     }