Display multi-line messages correctly in query results

src/sql/parts/query/editor/messagePanel.ts

@@ -74,8 +74,9 @@ export class MessagePanelState {
 }
 
 export class MessagePanel extends ViewletPanel {
+	private messageLineCountMap = new Map<IResultMessage, number>();
 	private ds = new MessageDataSource();
-	private renderer = new MessageRenderer();
+	private renderer = new MessageRenderer(this.messageLineCountMap);
 	private model = new Model();
 	private controller: MessageController;
 	private container = $('div message-tree').getHTMLElement();
@@ -143,29 +144,40 @@ export class MessagePanel extends ViewletPanel {
 
 	private onMessage(message: IResultMessage | IResultMessage[]) {
 		let hasError = false;
+		let lines: number;
 		if (isArray(message)) {
 			hasError = message.find(e => e.isError) ? true : false;
+			lines = message.reduce((currentTotal, resultMessage) => currentTotal + this.countMessageLines(resultMessage), 0);
 			this.model.messages.push(...message);
 		} else {
 			hasError = message.isError;
+			lines = this.countMessageLines(message);
 			this.model.messages.push(message);
 		}
+		this.maximumBodySize += lines * 22;
 		if (hasError) {
 			this.setExpanded(true);
 		}
 		if (this.state.scrollPosition) {
 			this.tree.refresh(this.model).then(() => {
-				this.tree.setScrollPosition(1);
+				// Restore the previous scroll position when switching between tabs
+				this.tree.setScrollPosition(this.state.scrollPosition);
 			});
 		} else {
 			const previousScrollPosition = this.tree.getScrollPosition();
 			this.tree.refresh(this.model).then(() => {
+				// Scroll to the end if the user was already at the end otherwise leave the current scroll position
 				if (previousScrollPosition === 1) {
 					this.tree.setScrollPosition(1);
 				}
 			});
 		}
-		this.maximumBodySize = this.model.messages.length * 22;
+	}
+
+	private countMessageLines(resultMessage: IResultMessage): number {
+		let lines = resultMessage.message.split('\n').length;
+		this.messageLineCountMap.set(resultMessage, lines);
+		return lines;
 	}
 
 	private reset() {
@@ -220,8 +232,15 @@ class MessageDataSource implements IDataSource {
 }
 
 class MessageRenderer implements IRenderer {
+	constructor(private messageLineCountMap: Map<IResultMessage, number>) {
+	}
+
 	getHeight(tree: ITree, element: any): number {
-		return 22;
+		const lineHeight = 22;
+		if (this.messageLineCountMap.has(element)) {
+			return lineHeight * this.messageLineCountMap.get(element);
+		}
+		return lineHeight;
 	}
 
 	getTemplateId(tree: ITree, element: any): string {
@@ -258,7 +277,7 @@ class MessageRenderer implements IRenderer {
 	renderElement(tree: ITree, element: IResultMessage, templateId: string, templateData: IMessageTemplate | IBatchTemplate): void {
 		if (templateId === TemplateIds.MESSAGE || templateId === TemplateIds.ERROR) {
 			let data: IMessageTemplate = templateData;
-			data.message.innerText = element.message.replace(/(\r\n|\n|\r)/g, ' ');
+			data.message.innerText = element.message;
 		} else if (templateId === TemplateIds.BATCH) {
 			let data = templateData as IBatchTemplate;
 			data.timeStamp.innerText = element.time;