fix: ensure all Cline instances update history UI for new tasks

Refactors state update logic to ensure that when task history
is modified (e.g., a new task is created or status changes),
all active ClineProvider instances (sidebar and editor tabs)
receive the updated state and refresh their UI.

The `postStateToWebview()` call is removed from `Task.addToClineMessages()`
and is now handled within `ClineProvider.updateTaskHistory()`, which
iterates over all active instances to broadcast the new state.
This guarantees timely UI updates across all open views.

Signed-off-by: Eric Wheeler <[email protected]>

Author: Eric Wheeler

src/core/task/Task.ts

@@ -321,7 +321,7 @@ export class Task extends EventEmitter<ClineEvents> {
 
 	private async addToClineMessages(message: ClineMessage) {
 		this.clineMessages.push(message)
-		await this.providerRef.deref()?.postStateToWebview()
+		// Removed direct call to postStateToWebview(), ClineProvider.updateTaskHistory will handle it
 		this.emit("message", { action: "created", message })
 		await this.saveClineMessages()
 	}

src/core/webview/ClineProvider.ts

@@ -1446,6 +1446,12 @@ export class ClineProvider extends EventEmitter<ClineProviderEvents> implements
 		}
 
 		await this.updateGlobalState("taskHistory", history)
+
+		// Post the updated state to all active webview instances
+		for (const instance of ClineProvider.activeInstances) {
+			await instance.postStateToWebview()
+		}
+
 		return history
 	}