debug source: give priority to sourceReference than to paht when determining if internal

fixes #16913

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

@@ -4,7 +4,6 @@
  *--------------------------------------------------------------------------------------------*/
 
 import uri from 'vs/base/common/uri';
-import * as paths from 'vs/base/common/paths';
 import { DEBUG_SCHEME } from 'vs/workbench/parts/debug/common/debug';
 
 export class Source {
@@ -15,7 +14,8 @@ export class Source {
 	private static INTERNAL_URI_PREFIX = `${DEBUG_SCHEME}://internal/`;
 
 	constructor(public raw: DebugProtocol.Source, available = true) {
-		this.uri = raw.path ? uri.file(paths.normalize(raw.path)) : uri.parse(Source.INTERNAL_URI_PREFIX + raw.sourceReference + '/' + raw.name);
+		const path = raw.path || raw.name;
+		this.uri = raw.sourceReference > 0 ? uri.parse(Source.INTERNAL_URI_PREFIX + raw.sourceReference + '/' + path) : uri.file(path);
 		this.available = available;
 	}
 

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

@@ -555,7 +555,7 @@ export class CallStackRenderer implements IRenderer {
 
 	private renderStackFrame(stackFrame: debug.IStackFrame, data: IStackFrameTemplateData): void {
 		stackFrame.source.available ? dom.removeClass(data.stackFrame, 'disabled') : dom.addClass(data.stackFrame, 'disabled');
-		data.file.title = stackFrame.source.uri.fsPath;
+		data.file.title = stackFrame.source.raw.path || stackFrame.source.name;
 		data.label.textContent = stackFrame.name;
 		data.label.title = stackFrame.name;
 		data.fileName.textContent = getSourceName(stackFrame.source, this.contextService);