fixes #17739

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

@@ -6,14 +6,13 @@
 import * as lifecycle from 'vs/base/common/lifecycle';
 import uri from 'vs/base/common/uri';
 import { TPromise } from 'vs/base/common/winjs.base';
-import { guessMimeTypes } from 'vs/base/common/mime';
+import { guessMimeTypes, MIME_TEXT } from 'vs/base/common/mime';
 import { IModel } from 'vs/editor/common/editorCommon';
 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 { Model } from 'vs/workbench/parts/debug/common/debugModel';
 import { Source } from 'vs/workbench/parts/debug/common/debugSource';
 
 export class DebugContentProvider implements IWorkbenchContribution, ITextModelContentProvider {
@@ -52,9 +51,12 @@ export class DebugContentProvider implements IWorkbenchContribution, ITextModelC
 			this.modelsToDispose.push(model);
 
 			return model;
-		}, err => {
-			(<Model>this.debugService.getModel()).sourceIsUnavailable(resource);
-			return err;
+		}, (err: DebugProtocol.ErrorResponse) => {
+			this.debugService.deemphasizeSource(resource);
+			const modePromise = this.modeService.getOrCreateMode(MIME_TEXT);
+			const model = this.modelService.createModel(err.message, modePromise, resource);
+
+			return model;
 		});
 	}
 }

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

@@ -476,6 +476,11 @@ export interface IDebugService {
 	 */
 	restartProcess(process: IProcess): TPromise<any>;
 
+	/**
+	 * Deemphasizes all sources with the passed uri. Source will appear as grayed out in callstack view.
+	 */
+	deemphasizeSource(uri: uri): void;
+
 	/**
 	 * Gets the current debug model.
 	 */

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

@@ -556,7 +556,7 @@ export class Process implements debug.IProcess {
 		}
 	}
 
-	public sourceIsUnavailable(uri: uri): void {
+	public deemphasizeSource(uri: uri): void {
 		this.threads.forEach(thread => {
 			thread.getCallStack().forEach(stackFrame => {
 				if (stackFrame.source.uri.toString() === uri.toString()) {
@@ -926,8 +926,8 @@ export class Model implements debug.IModel {
 		this._onDidChangeWatchExpressions.fire();
 	}
 
-	public sourceIsUnavailable(uri: uri): void {
-		this.processes.forEach(p => p.sourceIsUnavailable(uri));
+	public deemphasizeSource(uri: uri): void {
+		this.processes.forEach(p => p.deemphasizeSource(uri));
 		this._onDidChangeCallStack.fire();
 	}
 

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

@@ -801,6 +801,10 @@ export class DebugService implements debug.IDebugService {
 		});
 	}
 
+	public deemphasizeSource(uri: uri): void {
+		this.model.deemphasizeSource(uri);
+	}
+
 	public restartProcess(process: debug.IProcess): TPromise<any> {
 		if (!process) {
 			return this.createProcess(this.viewModel.selectedConfigurationName);

src/vs/workbench/parts/debug/test/common/mockDebug.ts

@@ -86,6 +86,8 @@ export class MockDebugService implements debug.IDebugService {
 	public getViewModel(): debug.IViewModel {
 		return null;
 	}
+
+	public deemphasizeSource(uri: uri): void { }
 }
 
 export class MockSession implements debug.ISession {