agent-host: route long question text through detailedMessage (#317650)

* agent-host: route long question text through detailedMessage

Long elicitation prompts from the agent host were being placed into the question title/description, causing the question carousel header to grow tall and squeeze out the scrollable input area. Route the long body through detailedMessage (rendered inside the scrollable container) and keep the title short by splitting on the first newline when no explicit title is provided.

Fixes #316544

(Commit message generated by Copilot)

* Potential fix for pull request finding

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

---------

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

Author: connor4312

src/vs/workbench/contrib/chat/browser/agentSessions/agentHost/agentHostSessionHandler.ts

@@ -1790,13 +1790,22 @@ export class AgentHostSessionHandler extends Disposable implements IChatSessionC
 		}
 
 		const questions: IChatQuestion[] = (inputReq.questions ?? []).map((q): IChatQuestion => {
+			let title = q.title;
+			let message = q.message;
+			if (!title) {
+				const EOL = q.message.indexOf('\n');
+				title = EOL === -1 ? q.message : q.message.substring(0, EOL).trim();
+				message = EOL === -1 ? '' : q.message.substring(EOL + 1).trim();
+			}
+			const detailedMessage = new MarkdownString(message, { isTrusted: false });
+
 			switch (q.kind) {
 				case SessionInputQuestionKind.SingleSelect:
 					return {
 						id: q.id,
 						type: 'singleSelect',
-						title: q.title ?? q.message,
-						description: q.title !== undefined ? q.message : undefined,
+						title,
+						detailedMessage,
 						required: q.required,
 						allowFreeformInput: q.allowFreeformInput ?? true,
 						options: q.options.map(o => ({ id: o.id, label: o.label, value: o.id })),
@@ -1805,8 +1814,8 @@ export class AgentHostSessionHandler extends Disposable implements IChatSessionC
 					return {
 						id: q.id,
 						type: 'multiSelect',
-						title: q.title ?? q.message,
-						description: q.title !== undefined ? q.message : undefined,
+						title,
+						detailedMessage,
 						required: q.required,
 						allowFreeformInput: q.allowFreeformInput ?? true,
 						options: q.options.map(o => ({ id: o.id, label: o.label, value: o.id })),
@@ -1815,17 +1824,17 @@ export class AgentHostSessionHandler extends Disposable implements IChatSessionC
 					return {
 						id: q.id,
 						type: 'text',
-						title: q.title ?? q.message,
-						description: q.title !== undefined ? q.message : undefined,
+						title,
+						detailedMessage,
 						required: q.required,
 						defaultValue: q.defaultValue,
 					};
 				default:
 					return {
 						id: q.id,
 						type: 'text',
-						title: q.title ?? q.message,
-						description: q.title !== undefined ? q.message : undefined,
+						title,
+						detailedMessage,
 						required: q.required,
 					};
 			}
@@ -1932,6 +1941,7 @@ export class AgentHostSessionHandler extends Disposable implements IChatSessionC
 		}));
 	}
 
+
 	/**
 	 * Handle a URL-style {@link SessionInputRequest} by rendering a
 	 * {@link ChatElicitationRequestPart} that prompts the user to open the