debug: allow to set focussed thread with no call stack

fixes #6214

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

@@ -134,13 +134,14 @@ export class DebugEditorModelManager implements IWorkbenchContribution {
 	private createCallStackDecorations(modelUrlStr: string): editorcommon.IModelDeltaDecoration[] {
 		const result: editorcommon.IModelDeltaDecoration[] = [];
 		const focusedStackFrame = this.debugService.getViewModel().getFocusedStackFrame();
+		const focusedThreadId = this.debugService.getViewModel().getFocusedThreadId();
 		const allThreads = this.debugService.getModel().getThreads();
-		if (!focusedStackFrame || !allThreads[focusedStackFrame.threadId] || !allThreads[focusedStackFrame.threadId].getCachedCallStack()) {
+		if (!focusedStackFrame || !allThreads[focusedThreadId] || !allThreads[focusedThreadId].getCachedCallStack()) {
 			return result;
 		}
 
 		// only show decorations for the currently focussed thread.
-		const thread = allThreads[focusedStackFrame.threadId];
+		const thread = allThreads[focusedThreadId];
 		thread.getCachedCallStack().filter(sf => sf.source.uri.toString() === modelUrlStr).forEach(sf => {
 			const wholeLineRange = createRange(sf.lineNumber, sf.column, sf.lineNumber, Number.MAX_VALUE);
 

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

@@ -9,6 +9,7 @@ import debug = require('vs/workbench/parts/debug/common/debug');
 export class ViewModel implements debug.IViewModel {
 
 	private focusedStackFrame: debug.IStackFrame;
+	private focusedThread: debug.IThread;
 	private selectedExpression: debug.IExpression;
 	private selectedFunctionBreakpoint: debug.IFunctionBreakpoint;
 	private _onDidFocusStackFrame: Emitter<debug.IStackFrame>;
@@ -31,8 +32,9 @@ export class ViewModel implements debug.IViewModel {
 		return this.focusedStackFrame;
 	}
 
-	public setFocusedStackFrame(focusedStackFrame: debug.IStackFrame): void {
+	public setFocusedStackFrame(focusedStackFrame: debug.IStackFrame, focusedThread: debug.IThread): void {
 		this.focusedStackFrame = focusedStackFrame;
+		this.focusedThread = focusedThread;
 		this._onDidFocusStackFrame.fire(focusedStackFrame);
 	}
 
@@ -41,7 +43,7 @@ export class ViewModel implements debug.IViewModel {
 	}
 
 	public getFocusedThreadId(): number {
-		return this.focusedStackFrame ? this.focusedStackFrame.threadId : 0;
+		return this.focusedThread ? this.focusedThread.threadId : 0;
 	}
 
 	public getSelectedExpression(): debug.IExpression {

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

@@ -251,17 +251,18 @@ export class DebugService implements debug.IDebugService {
 					allThreadsStopped: event.body.allThreadsStopped
 				});
 
-				this.model.getThreads()[threadId].getCallStack(this).then(callStack => {
+				const thread = this.model.getThreads()[threadId];
+				thread.getCallStack(this).then(callStack => {
 					if (callStack.length > 0) {
 						// focus first stack frame from top that has source location
 						const stackFrameToFocus = arrays.first(callStack, sf => sf.source && sf.source.available, callStack[0]);
-						this.setFocusedStackFrameAndEvaluate(stackFrameToFocus).done(null, errors.onUnexpectedError);
+						this.setFocusedStackFrameAndEvaluate(stackFrameToFocus, thread).done(null, errors.onUnexpectedError);
 						this.windowService.getWindow().focus();
 						aria.alert(nls.localize('debuggingPaused', "Debugging paused, reason {0}, {1} {2}", event.body.reason, stackFrameToFocus.source ? stackFrameToFocus.source.name : '', stackFrameToFocus.lineNumber));
 
 						return this.openOrRevealSource(stackFrameToFocus.source, stackFrameToFocus.lineNumber, false, false);
 					} else {
-						this.setFocusedStackFrameAndEvaluate(null).done(null, errors.onUnexpectedError);
+						this.setFocusedStackFrameAndEvaluate(null, thread).done(null, errors.onUnexpectedError);
 					}
 				});
 			}, errors.onUnexpectedError);
@@ -394,8 +395,12 @@ export class DebugService implements debug.IDebugService {
 		return !!this.contextService.getWorkspace();
 	}
 
-	public setFocusedStackFrameAndEvaluate(focusedStackFrame: debug.IStackFrame): TPromise<void> {
-		this.viewModel.setFocusedStackFrame(focusedStackFrame);
+	public setFocusedStackFrameAndEvaluate(focusedStackFrame: debug.IStackFrame, thread?: debug.IThread): TPromise<void> {
+		if (!thread && focusedStackFrame) {
+			thread = this.model.getThreads()[focusedStackFrame.threadId];
+		}
+
+		this.viewModel.setFocusedStackFrame(focusedStackFrame, thread);
 		if (focusedStackFrame) {
 			return this.model.evaluateWatchExpressions(this.session, focusedStackFrame);
 		} else {

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

@@ -5,7 +5,7 @@
 
 import assert = require('assert');
 import { ViewModel } from 'vs/workbench/parts/debug/common/debugViewModel';
-import { StackFrame, Expression } from 'vs/workbench/parts/debug/common/debugModel';
+import { StackFrame, Expression, Thread } from 'vs/workbench/parts/debug/common/debugModel';
 
 suite('Debug - View Model', () => {
 	var model: ViewModel;
@@ -22,7 +22,7 @@ suite('Debug - View Model', () => {
 		assert.equal(model.getFocusedStackFrame(), null);
 		assert.equal(model.getFocusedThreadId(), 0);
 		const frame = new StackFrame(1, 1, null, 'app.js', 1, 1);
-		model.setFocusedStackFrame(frame);
+		model.setFocusedStackFrame(frame, new Thread('myThread', 1));
 
 		assert.equal(model.getFocusedStackFrame(), frame);
 		assert.equal(model.getFocusedThreadId(), 1);