Fix the save/discard/revert flow for Prompt Settings (#4623)

Add support for the save/discard flow for support prompt setting page

Normally when you edit things on the settings pages, the save button lights up,
allowing you to discard your changes. Currently the prompts page doesn't support this flow-
the prompts are immediately saved when they change.

With this change, we use the normal cachedState system in the SettingView, allowing users to dicard changes to their prompts like any other setting.
This removed the need for the resetSupportPrompt event since we send the entire state of the support prompts (same as before).

Test plan:
* Manually verified prompts can be saved/discarded for different types of support prompts.

src/core/webview/webviewMessageHandler.ts

@@ -829,13 +829,12 @@ export const webviewMessageHandler = async (
 			break
 		case "updateSupportPrompt":
 			try {
-				if (Object.keys(message?.values ?? {}).length === 0) {
+				if (!message?.values) {
 					return
 				}
 
-				const existingPrompts = getGlobalState("customSupportPrompts") ?? {}
-				const updatedPrompts = { ...existingPrompts, ...message.values }
-				await updateGlobalState("customSupportPrompts", updatedPrompts)
+				// Replace all prompts with the new values from the cached state
+				await updateGlobalState("customSupportPrompts", message.values)
 				await provider.postStateToWebview()
 			} catch (error) {
 				provider.log(
@@ -844,24 +843,6 @@ export const webviewMessageHandler = async (
 				vscode.window.showErrorMessage(t("common:errors.update_support_prompt"))
 			}
 			break
-		case "resetSupportPrompt":
-			try {
-				if (!message?.text) {
-					return
-				}
-
-				const existingPrompts = getGlobalState("customSupportPrompts") ?? {}
-				const updatedPrompts = { ...existingPrompts }
-				updatedPrompts[message.text] = undefined
-				await updateGlobalState("customSupportPrompts", updatedPrompts)
-				await provider.postStateToWebview()
-			} catch (error) {
-				provider.log(
-					`Error reset support prompt: ${JSON.stringify(error, Object.getOwnPropertyNames(error), 2)}`,
-				)
-				vscode.window.showErrorMessage(t("common:errors.reset_support_prompt"))
-			}
-			break
 		case "updatePrompt":
 			if (message.promptMode && message.customPrompt !== undefined) {
 				const existingPrompts = getGlobalState("customModePrompts") ?? {}

src/shared/WebviewMessage.ts

@@ -118,7 +118,6 @@ export interface WebviewMessage {
 		| "mode"
 		| "updatePrompt"
 		| "updateSupportPrompt"
-		| "resetSupportPrompt"
 		| "getSystemPrompt"
 		| "copySystemPrompt"
 		| "systemPrompt"

webview-ui/src/components/settings/PromptsSettings.tsx

@@ -11,11 +11,14 @@ import { SectionHeader } from "./SectionHeader"
 import { Section } from "./Section"
 import { MessageSquare } from "lucide-react"
 
-const PromptsSettings = () => {
-	const { t } = useAppTranslation()
+interface PromptsSettingsProps {
+	customSupportPrompts: Record<string, string | undefined>
+	setCustomSupportPrompts: (prompts: Record<string, string | undefined>) => void
+}
 
-	const { customSupportPrompts, listApiConfigMeta, enhancementApiConfigId, setEnhancementApiConfigId } =
-		useExtensionState()
+const PromptsSettings = ({ customSupportPrompts, setCustomSupportPrompts }: PromptsSettingsProps) => {
+	const { t } = useAppTranslation()
+	const { listApiConfigMeta, enhancementApiConfigId, setEnhancementApiConfigId } = useExtensionState()
 
 	const [testPrompt, setTestPrompt] = useState("")
 	const [isEnhancing, setIsEnhancing] = useState(false)
@@ -37,19 +40,14 @@ const PromptsSettings = () => {
 	}, [])
 
 	const updateSupportPrompt = (type: SupportPromptType, value: string | undefined) => {
-		vscode.postMessage({
-			type: "updateSupportPrompt",
-			values: {
-				[type]: value,
-			},
-		})
+		const updatedPrompts = { ...customSupportPrompts, [type]: value }
+		setCustomSupportPrompts(updatedPrompts)
 	}
 
 	const handleSupportReset = (type: SupportPromptType) => {
-		vscode.postMessage({
-			type: "resetSupportPrompt",
-			text: type,
-		})
+		const updatedPrompts = { ...customSupportPrompts }
+		delete updatedPrompts[type]
+		setCustomSupportPrompts(updatedPrompts)
 	}
 
 	const getSupportPromptValue = (type: SupportPromptType): string => {

webview-ui/src/components/settings/SettingsView.tsx

@@ -171,6 +171,7 @@ const SettingsView = forwardRef<SettingsViewRef, SettingsViewProps>(({ onDone, t
 		customCondensingPrompt,
 		codebaseIndexConfig,
 		codebaseIndexModels,
+		customSupportPrompts,
 	} = cachedState
 
 	const apiConfiguration = useMemo(() => cachedState.apiConfiguration ?? {}, [cachedState.apiConfiguration])
@@ -242,6 +243,17 @@ const SettingsView = forwardRef<SettingsViewRef, SettingsViewProps>(({ onDone, t
 		})
 	}, [])
 
+	const setCustomSupportPromptsField = useCallback((prompts: Record<string, string | undefined>) => {
+		setCachedState((prevState) => {
+			if (JSON.stringify(prevState.customSupportPrompts) === JSON.stringify(prompts)) {
+				return prevState
+			}
+
+			setChangeDetected(true)
+			return { ...prevState, customSupportPrompts: prompts }
+		})
+	}, [])
+
 	const isSettingValid = !errorMessage
 
 	const handleSubmit = () => {
@@ -299,6 +311,7 @@ const SettingsView = forwardRef<SettingsViewRef, SettingsViewProps>(({ onDone, t
 			vscode.postMessage({ type: "alwaysAllowSubtasks", bool: alwaysAllowSubtasks })
 			vscode.postMessage({ type: "condensingApiConfigId", text: condensingApiConfigId || "" })
 			vscode.postMessage({ type: "updateCondensingPrompt", text: customCondensingPrompt || "" })
+			vscode.postMessage({ type: "updateSupportPrompt", values: customSupportPrompts || {} })
 			vscode.postMessage({ type: "upsertApiConfiguration", text: currentApiConfigName, apiConfiguration })
 			vscode.postMessage({ type: "telemetrySetting", text: telemetrySetting })
 			vscode.postMessage({ type: "codebaseIndexConfig", values: codebaseIndexConfig })
@@ -653,7 +666,12 @@ const SettingsView = forwardRef<SettingsViewRef, SettingsViewProps>(({ onDone, t
 					)}
 
 					{/* Prompts Section */}
-					{activeTab === "prompts" && <PromptsSettings />}
+					{activeTab === "prompts" && (
+						<PromptsSettings
+							customSupportPrompts={customSupportPrompts || {}}
+							setCustomSupportPrompts={setCustomSupportPromptsField}
+						/>
+					)}
 
 					{/* Experimental Section */}
 					{activeTab === "experimental" && (

webview-ui/src/context/ExtensionStateContext.tsx

@@ -123,29 +123,22 @@ export interface ExtensionStateContextType extends ExtensionState {
 export const ExtensionStateContext = createContext<ExtensionStateContextType | undefined>(undefined)
 
 export const mergeExtensionState = (prevState: ExtensionState, newState: ExtensionState) => {
-	const {
-		customModePrompts: prevCustomModePrompts,
-		customSupportPrompts: prevCustomSupportPrompts,
-		experiments: prevExperiments,
-		...prevRest
-	} = prevState
+	const { customModePrompts: prevCustomModePrompts, experiments: prevExperiments, ...prevRest } = prevState
 
 	const {
 		apiConfiguration,
 		customModePrompts: newCustomModePrompts,
-		customSupportPrompts: newCustomSupportPrompts,
+		customSupportPrompts,
 		experiments: newExperiments,
 		...newRest
 	} = newState
 
 	const customModePrompts = { ...prevCustomModePrompts, ...newCustomModePrompts }
-	const customSupportPrompts = { ...prevCustomSupportPrompts, ...newCustomSupportPrompts }
 	const experiments = { ...prevExperiments, ...newExperiments }
 	const rest = { ...prevRest, ...newRest }
 
-	// Note that we completely replace the previous apiConfiguration object with
-	// a new one since the state that is broadcast is the entire apiConfiguration
-	// and therefore merging is not necessary.
+	// Note that we completely replace the previous apiConfiguration and customSupportPrompts objects
+	// with new ones since the state that is broadcast is the entire objects so merging is not necessary.
 	return { ...rest, apiConfiguration, customModePrompts, customSupportPrompts, experiments }
 }