debug: double click on variable to set value

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

@@ -668,6 +668,22 @@ export class VariablesAccessibilityProvider implements tree.IAccessibilityProvid
 	}
 }
 
+export class VariablesController extends BaseDebugController {
+
+	protected onLeftClick(tree: tree.ITree, element: any, event: IMouseEvent): boolean {
+		// double click on primitive value: open input box to be able to set the value
+		if (element instanceof model.Variable && event.detail === 2) {
+			const expression = <debug.IExpression>element;
+			if (expression.reference === 0) {
+				this.debugService.getViewModel().setSelectedExpression(expression);
+			}
+			return true;
+		}
+
+		return super.onLeftClick(tree, element, event);
+	}
+}
+
 // watch expressions
 
 export class WatchExpressionsActionProvider implements renderer.IActionProvider {

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

@@ -75,7 +75,7 @@ export class VariablesView extends viewlet.CollapsibleViewletView {
 			dataSource: new viewer.VariablesDataSource(this.debugService),
 			renderer: this.instantiationService.createInstance(viewer.VariablesRenderer),
 			accessibilityProvider: new viewer.VariablesAccessibilityProvider(),
-			controller: new viewer.BaseDebugController(this.debugService, this.contextMenuService, new viewer.VariablesActionProvider(this.instantiationService))
+			controller: new viewer.VariablesController(this.debugService, this.contextMenuService, new viewer.VariablesActionProvider(this.instantiationService))
 		}, debugTreeOptions(nls.localize('variablesAriaTreeLabel', "Debug Variables")));
 
 		const viewModel = this.debugService.getViewModel();