Flags a widget to have its size renegotiated.
This should be called when a widget for some reason has a new size request. For example, when you change the text in a [class@Gtk.Label], the label queues a resize to ensure there’s enough space for the new text.
Note that you cannot call queue_resize on a widget from inside its implementation of the [ vfunc@Gtk.Widget.size_allocate] virtual method. Calls to queue_resize from inside [vfunc@Gtk.Widget.size_allocate] will be silently ignored.
This function is only for use in widget implementations.