setState() called after dispose()

[Abdulvaliy]

I face the issue several times after using the package.

I think, in dropdown_search.dart file, at 375 line it must be checked if context is mounted before updating state (which is in "didChange" callback)

if (state.value != getSelectedItem) {
    WidgetsBinding.instance.addPostFrameCallback((_) {
        if (!context.mounted) return; // TODO (maybe) add this line of code
            state.didChange(getSelectedItem);
      });
}

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