debug: fix ANSI styling disappearing from REPL when a session ends (#…

…229753)

Fixes #229752

src/vs/workbench/contrib/debug/browser/debugExpressionRenderer.ts

@@ -104,7 +104,8 @@ export class DebugExpressionRenderer {
 
 	renderValue(container: HTMLElement, expressionOrValue: IExpressionValue | string, options: IRenderValueOptions = {}): IDisposable {
 		const store = new DisposableStore();
-		const supportsANSI = !!options.session?.capabilities.supportsANSIStyling;
+		// Use remembered capabilities so REPL elements can render even once a session ends
+		const supportsANSI = !!options.session?.rememberedCapabilities?.supportsANSIStyling;
 
 		let value = typeof expressionOrValue === 'string' ? expressionOrValue : expressionOrValue.value;
 

src/vs/workbench/contrib/debug/browser/debugSession.ts

@@ -51,6 +51,7 @@ const TRIGGERED_BREAKPOINT_MAX_DELAY = 1500;
 
 export class DebugSession implements IDebugSession, IDisposable {
 	parentSession: IDebugSession | undefined;
+	rememberedCapabilities?: DebugProtocol.Capabilities;
 
 	private _subId: string | undefined;
 	raw: RawDebugSession | undefined; // used in tests
@@ -369,6 +370,7 @@ export class DebugSession implements IDebugSession, IDisposable {
 
 			this.initialized = true;
 			this._onDidChangeState.fire();
+			this.rememberedCapabilities = this.raw.capabilities;
 			this.debugService.setExceptionBreakpointsForSession(this, (this.raw && this.raw.capabilities.exceptionBreakpointFilters) || []);
 			this.debugService.getModel().registerBreakpointModes(this.configuration.type, this.raw.capabilities.breakpointModes || []);
 		} catch (err) {

src/vs/workbench/contrib/debug/common/debug.ts

@@ -412,8 +412,10 @@ export interface IDebugSession extends ITreeElement {
 	readonly onDidChangeState: Event<void>;
 	readonly onDidChangeReplElements: Event<IReplElement | undefined>;
 
-	// DA capabilities
+	/** DA capabilities. Set only when there is a running session available. */
 	readonly capabilities: DebugProtocol.Capabilities;
+	/** DA capabilities. These are retained on the session even after is implementation ends. */
+	readonly rememberedCapabilities?: DebugProtocol.Capabilities;
 
 	// DAP events