fix: prevent checkpoint restore from auto-resuming tasks

- Modified ClineProvider.cancelTask() to accept optional startTask parameter
- Updated checkpointRestore() to pass startTask: false to cancelTask()
- Updated checkpointRestoreHandler delete operation to pass startTask: false to createTaskWithHistoryItem()
- Updated tests to reflect the new behavior

This fixes the issue where checkpoint restore would re-execute
restored tasks instead of just displaying the restored state.

Fixes #10402

src/core/checkpoints/index.ts

@@ -294,7 +294,11 @@ export async function checkpointRestore(
 		// I'd like to revisit this in the future and try to improve the
 		// task flow and the communication between the webview and the
 		// `Task` instance.
-		provider?.cancelTask()
+		//
+		// Pass startTask: false to prevent the rehydrated task from auto-resuming
+		// and re-executing the restored message history. The task should only
+		// display the restored state, not continue processing.
+		provider?.cancelTask({ startTask: false })
 	} catch (err) {
 		provider?.log("[checkpointRestore] disabling checkpoints for this task")
 		task.enableCheckpoints = false

src/core/webview/ClineProvider.ts

@@ -2739,7 +2739,7 @@ export class ClineProvider
 		return task
 	}
 
-	public async cancelTask(): Promise<void> {
+	public async cancelTask(options?: { startTask?: boolean }): Promise<void> {
 		const task = this.getCurrentTask()
 
 		if (!task) {
@@ -2807,7 +2807,10 @@ export class ClineProvider
 		}
 
 		// Clears task again, so we need to abortTask manually above.
-		await this.createTaskWithHistoryItem({ ...historyItem, rootTask, parentTask })
+		// Pass startTask option to control whether the rehydrated task auto-resumes.
+		// When called from checkpoint restore, startTask should be false to prevent
+		// the task from re-executing its message history.
+		await this.createTaskWithHistoryItem({ ...historyItem, rootTask, parentTask }, { startTask: options?.startTask })
 	}
 
 	// Clear the current task without treating it as a subtask.

src/core/webview/__tests__/checkpointRestoreHandler.spec.ts

@@ -190,7 +190,8 @@ describe("checkpointRestoreHandler", () => {
 			expect(mockProvider.getTaskWithId).toHaveBeenCalledWith("test-task-123")
 
 			// Verify createTaskWithHistoryItem was called with the correct history item
-			expect(mockProvider.createTaskWithHistoryItem).toHaveBeenCalledWith(expectedHistoryItem)
+			// startTask: false prevents the restored task from auto-resuming
+			expect(mockProvider.createTaskWithHistoryItem).toHaveBeenCalledWith(expectedHistoryItem, { startTask: false })
 		})
 
 		it("should not save messages or reinitialize for edit operation", async () => {

src/core/webview/checkpointRestoreHandler.ts

@@ -73,8 +73,11 @@ export async function handleCheckpointRestoreOperation(config: CheckpointRestore
 			})
 
 			// Get the updated history item and reinitialize
+			// Pass startTask: false to prevent the restored task from auto-resuming
+			// and re-executing the message history. The task should only display
+			// the restored state, not continue processing.
 			const { historyItem } = await provider.getTaskWithId(currentCline.taskId)
-			await provider.createTaskWithHistoryItem(historyItem)
+			await provider.createTaskWithHistoryItem(historyItem, { startTask: false })
 		}
 		// For edit operations, the task cancellation in checkpointRestore
 		// will trigger reinitialization, which will process pendingEditAfterRestore