Spreadsheet: Allow sheet renaming after double clicking on the tabwidget

Userland/Applications/Spreadsheet/SpreadsheetWidget.cpp

@@ -338,6 +338,21 @@ void SpreadsheetWidget::setup_tabs(NonnullRefPtrVector<Sheet> new_sheets)
         m_tab_context_menu_sheet_view = static_cast<SpreadsheetView&>(widget);
         m_tab_context_menu->popup(event.screen_position());
     };
+
+    m_tab_widget->on_double_click = [&](auto& widget) {
+        m_tab_context_menu_sheet_view = static_cast<SpreadsheetView&>(widget);
+        VERIFY(m_tab_context_menu_sheet_view);
+
+        auto* sheet_ptr = m_tab_context_menu_sheet_view->sheet_if_available();
+        VERIFY(sheet_ptr); // How did we get here without a sheet?
+        auto& sheet = *sheet_ptr;
+        String new_name;
+        if (GUI::InputBox::show(window(), new_name, String::formatted("New name for '{}'", sheet.name()), "Rename sheet") == GUI::Dialog::ExecOK) {
+            sheet.set_name(new_name);
+            sheet.update();
+            m_tab_widget->set_tab_title(static_cast<GUI::Widget&>(*m_tab_context_menu_sheet_view), new_name);
+        }
+    };
 }
 
 void SpreadsheetWidget::try_generate_tip_for_input_expression(StringView source, size_t cursor_offset)