Allow a stack frame with no source that has a presentationHint

fixes #20677

src/vs/workbench/parts/debug/browser/media/debugViewlet.css

@@ -226,6 +226,15 @@
 	padding-right: 0.8em;
 }
 
+.debug-viewlet .debug-call-stack .stack-frame.label {
+	text-align: center;
+	font-style: italic;
+}
+
+.debug-viewlet .debug-call-stack .stack-frame.label > .file {
+	display: none;
+}
+
 .debug-viewlet .debug-call-stack .stack-frame > .file {
 	float: right;
 }

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

@@ -370,7 +370,8 @@ export class StackFrame implements IStackFrame {
 	}
 
 	public openInEditor(editorService: IWorkbenchEditorService, preserveFocus?: boolean, sideBySide?: boolean): TPromise<any> {
-		return editorService.openEditor({
+
+		return this.source.name === UNKNOWN_SOURCE_LABEL ? TPromise.as(null) : editorService.openEditor({
 			resource: this.source.uri,
 			description: this.source.origin,
 			options: {
@@ -449,9 +450,9 @@ export class Thread implements IThread {
 
 			return response.body.stackFrames.map((rsf, level) => {
 				if (!rsf) {
-					return new StackFrame(this, 0, new Source({ name: UNKNOWN_SOURCE_LABEL }, true), nls.localize('unknownStack', "Unknown stack location"), null, null);
+					return new StackFrame(this, 0, new Source({ name: UNKNOWN_SOURCE_LABEL }, rsf.presentationHint), nls.localize('unknownStack', "Unknown stack location"), null, null);
 				}
-				let source = rsf.source ? new Source(rsf.source, rsf.source.presentationHint === 'deemphasize') : new Source({ name: UNKNOWN_SOURCE_LABEL }, true);
+				let source = rsf.source ? new Source(rsf.source, rsf.source.presentationHint) : new Source({ name: UNKNOWN_SOURCE_LABEL }, rsf.presentationHint);
 				if (this.process.sources.has(source.uri.toString())) {
 					source = this.process.sources.get(source.uri.toString());
 				} else {
@@ -972,7 +973,7 @@ export class Model implements IModel {
 	public deemphasizeSource(uri: uri): void {
 		this.processes.forEach(p => {
 			if (p.sources.has(uri.toString())) {
-				p.sources.get(uri.toString()).deemphasize = true;
+				p.sources.get(uri.toString()).presenationHint = 'deemphasize';
 			}
 		});
 		this._onDidChangeCallStack.fire();

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

@@ -10,7 +10,7 @@ export class Source {
 
 	public uri: uri;
 
-	constructor(public raw: DebugProtocol.Source, public deemphasize: boolean) {
+	constructor(public raw: DebugProtocol.Source, public presenationHint: string) {
 		const path = raw.path || raw.name;
 		this.uri = raw.sourceReference > 0 ? uri.parse(`${DEBUG_SCHEME}:${path}`) : uri.file(path);
 	}

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

@@ -524,7 +524,8 @@ export class CallStackRenderer implements IRenderer {
 	}
 
 	private renderStackFrame(stackFrame: debug.IStackFrame, data: IStackFrameTemplateData): void {
-		stackFrame.source.deemphasize ? dom.addClass(data.stackFrame, 'disabled') : dom.removeClass(data.stackFrame, 'disabled');
+		stackFrame.source.presenationHint === 'deemphasize' ? dom.addClass(data.stackFrame, 'disabled') : dom.removeClass(data.stackFrame, 'disabled');
+		stackFrame.source.presenationHint === 'label' ? dom.addClass(data.stackFrame, 'label') : dom.removeClass(data.stackFrame, 'label');
 		data.file.title = stackFrame.source.raw.path || stackFrame.source.name;
 		if (stackFrame.source.raw.origin) {
 			data.file.title += `\n${stackFrame.source.raw.origin}`;

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

@@ -15,9 +15,9 @@ suite('Debug - Source', () => {
 			path: '/xx/yy/zz',
 			sourceReference: 0
 		};
-		const source = new Source(rawSource, false);
+		const source = new Source(rawSource, 'label');
 
-		assert.equal(source.deemphasize, false);
+		assert.equal(source.presenationHint, 'label');
 		assert.equal(source.name, rawSource.name);
 		assert.equal(source.inMemory, false);
 		assert.equal(source.reference, rawSource.sourceReference);
@@ -29,9 +29,9 @@ suite('Debug - Source', () => {
 			name: 'internalModule.js',
 			sourceReference: 11
 		};
-		const source = new Source(rawSource, true);
+		const source = new Source(rawSource, 'deemphasize');
 
-		assert.equal(source.deemphasize, true);
+		assert.equal(source.presenationHint, 'deemphasize');
 		assert.equal(source.name, rawSource.name);
 		assert.equal(source.inMemory, true);
 		assert.equal(source.reference, rawSource.sourceReference);