removeSymbols method
Removes the specified symbols
from the map. The symbols must be current
members of the symbols
set.
Change listeners are notified once the symbol has been removed on the platform side.
The returned Future completes once listeners have been notified.
Implementation
Future<void> removeSymbols(Iterable<Symbol> symbols) async {
await symbolManager!.removeAll(symbols);
notifyListeners();
}