ToolbarMenuButton: Move string to member. Cleanups
Also add missing #includes and resolve the C++20 lambda capture warning,
and add a g_assert() to ensure someone init()d and we have _popover_box.Edited by Daniel Boles
Also add missing #includes and resolve the C++20 lambda capture warning,
and add a g_assert() to ensure someone init()d and we have _popover_box.