fixes #75359

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

@@ -62,7 +62,7 @@ import { RunOnceScheduler } from 'vs/base/common/async';
 import { FuzzyScore, createMatches } from 'vs/base/common/filters';
 import { HighlightedLabel } from 'vs/base/browser/ui/highlightedlabel/highlightedLabel';
 import { IClipboardService } from 'vs/platform/clipboard/common/clipboardService';
-import { VariablesRenderer } from 'vs/workbench/contrib/debug/browser/variablesView';
+import { VariablesRenderer, variableSetEmitter } from 'vs/workbench/contrib/debug/browser/variablesView';
 
 const $ = dom.$;
 
@@ -274,6 +274,7 @@ export class Repl extends Panel implements IPrivateReplService, IHistoryNavigati
 			revealLastElement(this.tree);
 			this.history.add(this.replInput.getValue());
 			this.replInput.setValue('');
+			variableSetEmitter.fire();
 			const shouldRelayout = this.replInputHeight > Repl.REPL_INPUT_INITIAL_HEIGHT;
 			this.replInputHeight = Repl.REPL_INPUT_INITIAL_HEIGHT;
 			if (shouldRelayout) {

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

@@ -30,6 +30,7 @@ import { HighlightedLabel, IHighlight } from 'vs/base/browser/ui/highlightedlabe
 import { IClipboardService } from 'vs/platform/clipboard/common/clipboardService';
 
 const $ = dom.$;
+let forgetScopes = true;
 
 export const variableSetEmitter = new Emitter<void>();
 
@@ -99,7 +100,14 @@ export class VariablesView extends ViewletPanel {
 			const timeout = sf.explicit ? 0 : undefined;
 			this.onFocusStackFrameScheduler.schedule(timeout);
 		}));
-		this._register(variableSetEmitter.event(() => this.tree.updateChildren()));
+		this._register(variableSetEmitter.event(() => {
+			const stackFrame = this.debugService.getViewModel().focusedStackFrame;
+			if (stackFrame && forgetScopes) {
+				stackFrame.forgetScopes();
+			}
+			forgetScopes = true;
+			this.tree.updateChildren();
+		}));
 		this._register(this.tree.onMouseDblClick(e => this.onMouseDblClick(e)));
 		this._register(this.tree.onContextMenu(e => this.onContextMenu(e)));
 
@@ -256,7 +264,11 @@ export class VariablesRenderer extends AbstractExpressionsRenderer {
 				if (success && variable.value !== value) {
 					variable.setVariable(value)
 						// Need to force watch expressions and variables to update since a variable change can have an effect on both
-						.then(() => variableSetEmitter.fire());
+						.then(() => {
+							// Do not refresh scopes due to a node limitation #15520
+							forgetScopes = false;
+							variableSetEmitter.fire();
+						});
 				}
 			}
 		};

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

@@ -247,6 +247,7 @@ export class WatchExpressionsRenderer extends AbstractExpressionsRenderer {
 			onFinish: (value: string, success: boolean) => {
 				if (success && value) {
 					this.debugService.renameWatchExpression(expression.getId(), value);
+					variableSetEmitter.fire();
 				} else if (!expression.name) {
 					this.debugService.removeWatchExpressions(expression.getId());
 				}

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

@@ -301,6 +301,7 @@ export interface IStackFrame extends ITreeElement {
 	getScopes(): Promise<IScope[]>;
 	getMostSpecificScopes(range: IRange): Promise<ReadonlyArray<IScope>>;
 	getSpecificSourceName(): string;
+	forgetScopes(): void;
 	restart(): Promise<any>;
 	toString(): string;
 	openInEditor(editorService: IEditorService, preserveFocus?: boolean, sideBySide?: boolean): Promise<ITextEditor | null>;

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

@@ -314,7 +314,7 @@ export class Scope extends ExpressionContainer implements IScope {
 
 export class StackFrame implements IStackFrame {
 
-	private scopes: Promise<Scope[]> | null;
+	private scopes: Promise<Scope[]> | undefined;
 
 	constructor(
 		public thread: IThread,
@@ -324,9 +324,7 @@ export class StackFrame implements IStackFrame {
 		public presentationHint: string | undefined,
 		public range: IRange,
 		private index: number
-	) {
-		this.scopes = null;
-	}
+	) { }
 
 	getId(): string {
 		return `stackframe:${this.thread.getId()}:${this.frameId}:${this.index}`;
@@ -382,6 +380,10 @@ export class StackFrame implements IStackFrame {
 		return this.thread.session.restartFrame(this.frameId, this.thread.threadId);
 	}
 
+	forgetScopes(): void {
+		this.scopes = undefined;
+	}
+
 	toString(): string {
 		const lineNumberToString = typeof this.range.startLineNumber === 'number' ? `:${this.range.startLineNumber}` : '';
 		const sourceToString = `${this.source.inMemory ? this.source.name : this.source.uri.fsPath}${lineNumberToString}`;