debug: add session to model immediatly

fixes #62038

src/vs/workbench/api/electron-browser/mainThreadDebugService.ts

@@ -18,7 +18,6 @@ import { IWorkspaceFolder } from 'vs/platform/workspace/common/workspace';
 import { convertToVSCPaths, convertToDAPaths, stringToUri, uriToString } from 'vs/workbench/parts/debug/common/debugUtils';
 import { deepClone } from 'vs/base/common/objects';
 
-
 @extHostNamedCustomer(MainContext.MainThreadDebugService)
 export class MainThreadDebugService implements MainThreadDebugServiceShape, IDebugAdapterProvider {
 

src/vs/workbench/parts/debug/electron-browser/debugService.ts

@@ -423,7 +423,7 @@ export class DebugService implements IDebugService {
 	private doCreateSession(root: IWorkspaceFolder, configuration: { resolved: IConfig, unresolved: IConfig }): TPromise<boolean> {
 
 		const session = this.instantiationService.createInstance(DebugSession, configuration, root, this.model);
-
+		this.model.addSession(session);
 		// register listeners as the very first thing!
 		this.registerSessionListeners(session);
 

src/vs/workbench/parts/debug/electron-browser/debugSession.ts

@@ -166,7 +166,6 @@ export class DebugSession implements IDebugSession {
 						supportsRunInTerminalRequest: true, // #10574
 						locale: platform.locale
 					}).then(() => {
-						this.model.addSession(this);
 						this._onDidChangeState.fire();
 						this.model.setExceptionBreakpoints(this.raw.capabilities.exceptionBreakpointFilters);
 					});