fixes #107860

src/vs/workbench/contrib/debug/browser/debugActionViewItems.ts

@@ -234,6 +234,7 @@ export class StartDebugActionViewItem implements IActionViewItem {
 export class FocusSessionActionViewItem extends SelectActionViewItem {
 	constructor(
 		action: IAction,
+		session: IDebugSession | undefined,
 		@IDebugService protected readonly debugService: IDebugService,
 		@IThemeService themeService: IThemeService,
 		@IContextViewService contextViewService: IContextViewService,
@@ -262,15 +263,17 @@ export class FocusSessionActionViewItem extends SelectActionViewItem {
 		});
 		this._register(this.debugService.onDidEndSession(() => this.update()));
 
-		this.update();
+		this.update(session);
 	}
 
 	protected getActionContext(_: string, index: number): any {
 		return this.getSessions()[index];
 	}
 
-	private update() {
-		const session = this.getSelectedSession();
+	private update(session?: IDebugSession) {
+		if (!session) {
+			session = this.getSelectedSession();
+		}
 		const sessions = this.getSessions();
 		const names = sessions.map(s => {
 			const label = s.getLabel();

src/vs/workbench/contrib/debug/browser/debugToolBar.ts

@@ -75,7 +75,7 @@ export class DebugToolBar extends Themable implements IWorkbenchContribution {
 			orientation: ActionsOrientation.HORIZONTAL,
 			actionViewItemProvider: (action: IAction) => {
 				if (action.id === FocusSessionAction.ID) {
-					return this.instantiationService.createInstance(FocusSessionActionViewItem, action);
+					return this.instantiationService.createInstance(FocusSessionActionViewItem, action, undefined);
 				} else if (action instanceof MenuItemAction) {
 					return this.instantiationService.createInstance(MenuEntryActionViewItem, action);
 				} else if (action instanceof SubmenuItemAction) {

src/vs/workbench/contrib/debug/browser/debugViewlet.ts

@@ -171,7 +171,7 @@ export class DebugViewPaneContainer extends ViewPaneContainer {
 			return this.startDebugActionViewItem;
 		}
 		if (action.id === FocusSessionAction.ID) {
-			return new FocusSessionActionViewItem(action, this.debugService, this.themeService, this.contextViewService, this.configurationService);
+			return new FocusSessionActionViewItem(action, undefined, this.debugService, this.themeService, this.contextViewService, this.configurationService);
 		}
 		if (action instanceof MenuItemAction) {
 			return this.instantiationService.createInstance(MenuEntryActionViewItem, action);

src/vs/workbench/contrib/debug/browser/repl.ts

@@ -459,7 +459,8 @@ export class Repl extends ViewPane implements IHistoryNavigationWidget {
 
 	getActionViewItem(action: IAction): IActionViewItem | undefined {
 		if (action.id === SelectReplAction.ID) {
-			return this.instantiationService.createInstance(SelectReplActionViewItem, this.selectReplAction);
+			const session = (this.tree ? this.tree.getInput() : undefined) ?? this.debugService.getViewModel().focusedSession;
+			return this.instantiationService.createInstance(SelectReplActionViewItem, this.selectReplAction, session);
 		} else if (action.id === FILTER_ACTION_ID) {
 			this.filterActionViewItem = this.instantiationService.createInstance(ReplFilterActionViewItem, action, localize({ key: 'workbench.debug.filter.placeholder', comment: ['Text in the brackets after e.g. is not localizable'] }, "Filter (e.g. text, !exclude)"), this.filterState);
 			return this.filterActionViewItem;