explorer: Should maintain row focus after deleting a file

fixes #71315

src/vs/workbench/contrib/files/browser/views/explorerView.ts

@@ -588,6 +588,13 @@ export class ExplorerView extends ViewPane {
 		return this.tree.updateChildren(toRefresh, recursive);
 	}
 
+	focusNextIfItemFocused(item: ExplorerItem): void {
+		const focus = this.tree.getFocus();
+		if (focus.length === 1 && focus[0] === item) {
+			this.tree.focusNext();
+		}
+	}
+
 	getOptimalWidth(): number {
 		const parentNode = this.tree.getHTMLElement();
 		const childNodes = ([] as HTMLElement[]).slice.call(parentNode.querySelectorAll('.explorer-item .label-name')); // select all file labels

src/vs/workbench/contrib/files/common/explorerService.ts

@@ -278,6 +278,7 @@ export class ExplorerService implements IExplorerService {
 					const parent = element.parent;
 					// Remove Element from Parent (Model)
 					parent.removeChild(element);
+					this.view?.focusNextIfItemFocused(element);
 					// Refresh Parent (View)
 					await this.view?.refresh(false, parent);
 				}

src/vs/workbench/contrib/files/common/files.ts

@@ -65,6 +65,7 @@ export interface IExplorerView {
 	setTreeInput(): Promise<void>;
 	itemsCopied(tats: ExplorerItem[], cut: boolean, previousCut: ExplorerItem[] | undefined): void;
 	setEditable(stat: ExplorerItem, isEditing: boolean): Promise<void>;
+	focusNextIfItemFocused(item: ExplorerItem): void;
 }
 
 export const IExplorerService = createDecorator<IExplorerService>('explorerService');