groupBackdrop property

Whether the bar's glass reads the backdrop together, in one GlassBackdropGroup: the pill, the search and minimize pills. The selected-tab indicator lies over the pill and stays out of it, and so do the search pill while the keyboard moves it, the searchable bar's extra button (it fades out when search opens) and the bottom accessory. On Impeller with premium glass this saves a full-screen backdrop copy per surface. Inside a GlassBackdropGroup of your own the bar joins that group, so one group around an app bar and a tab bar makes them share a single read. Defaults to true; set false to keep the bar out of any group, e.g. when glass of your own lies over it.