Accessibility: Shift+Tab gets trapped in debug and problems panes.

fixes #116525

src/vs/base/browser/ui/actionbar/actionbar.ts

@@ -148,12 +148,8 @@ export class ActionBar extends Disposable implements IActionRunner {
 				eventHandled = this.focusNext();
 			} else if (event.equals(KeyCode.Escape) && this.cancelHasListener) {
 				this._onDidCancel.fire();
-			} else if ((event.equals(KeyCode.Tab) || event.equals(KeyMod.Shift | KeyCode.Tab)) && focusedItem instanceof BaseActionViewItem && focusedItem.trapsArrowNavigation) {
-				if (event.equals(KeyCode.Tab)) {
-					this.focusNext();
-				} else {
-					this.focusPrevious();
-				}
+			} else if (event.equals(KeyCode.Tab) && focusedItem instanceof BaseActionViewItem && focusedItem.trapsArrowNavigation) {
+				this.focusNext();
 			} else if (this.isTriggerKeyEvent(event)) {
 				// Staying out of the else branch even if not triggered
 				if (this._triggerKeys.keyDown) {

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

@@ -158,7 +158,19 @@ export class ReplFilterActionViewItem extends BaseActionViewItem {
 	}
 
 	focus(): void {
-		this.filterInputBox.focus();
+		if (this.filterInputBox) {
+			this.filterInputBox.focus();
+		}
+	}
+
+	blur(): void {
+		if (this.filterInputBox) {
+			this.filterInputBox.blur();
+		}
+	}
+
+	setFocusable(): void {
+		// noop input elements are focusable by default
 	}
 
 	getHistory(): string[] {

src/vs/workbench/contrib/markers/browser/markersViewActions.ts

@@ -283,6 +283,16 @@ export class MarkersFilterActionViewItem extends BaseActionViewItem {
 		}
 	}
 
+	blur(): void {
+		if (this.filterInputBox) {
+			this.filterInputBox.blur();
+		}
+	}
+
+	setFocusable(): void {
+		// noop input elements are focusable by default
+	}
+
 	get trapsArrowNavigation(): boolean {
 		return true;
 	}