debug: do not dispose of internal module models on session end

fixes #22741

src/vs/workbench/parts/debug/browser/debugContentProvider.ts

@@ -3,7 +3,6 @@
  *  Licensed under the MIT License. See License.txt in the project root for license information.
  *--------------------------------------------------------------------------------------------*/
 
-import * as lifecycle from 'vs/base/common/lifecycle';
 import uri from 'vs/base/common/uri';
 import * as paths from 'vs/base/common/paths';
 import { localize } from 'vs/nls';
@@ -14,12 +13,10 @@ import { IModelService } from 'vs/editor/common/services/modelService';
 import { IModeService } from 'vs/editor/common/services/modeService';
 import { ITextModelResolverService, ITextModelContentProvider } from 'vs/editor/common/services/resolverService';
 import { IWorkbenchContribution } from 'vs/workbench/common/contributions';
-import { DEBUG_SCHEME, IDebugService, State } from 'vs/workbench/parts/debug/common/debug';
+import { DEBUG_SCHEME, IDebugService } from 'vs/workbench/parts/debug/common/debug';
 
 export class DebugContentProvider implements IWorkbenchContribution, ITextModelContentProvider {
 
-	private modelsToDispose: IModel[];
-
 	constructor(
 		@ITextModelResolverService textModelResolverService: ITextModelResolverService,
 		@IDebugService private debugService: IDebugService,
@@ -27,12 +24,6 @@ export class DebugContentProvider implements IWorkbenchContribution, ITextModelC
 		@IModeService private modeService: IModeService
 	) {
 		textModelResolverService.registerTextModelContentProvider(DEBUG_SCHEME, this);
-		this.modelsToDispose = [];
-		this.debugService.onDidChangeState(state => {
-			if (state === State.Inactive) {
-				this.modelsToDispose = lifecycle.dispose(this.modelsToDispose);
-			}
-		});
 	}
 
 	public getId(): string {
@@ -52,7 +43,6 @@ export class DebugContentProvider implements IWorkbenchContribution, ITextModelC
 			const mime = response.body.mimeType || guessMimeTypes(resource.toString())[0];
 			const modePromise = this.modeService.getOrCreateMode(mime);
 			const model = this.modelService.createModel(response.body.content, modePromise, resource);
-			this.modelsToDispose.push(model);
 
 			return model;
 		}, (err: DebugProtocol.ErrorResponse) => {