/// - Selection is zero-width and in whitespace that corresponds to a Token whose direct ancestor is of type of type <typeparamref name="TSyntaxNode"/>.
/// - Selection is zero-width and in a header (defined by ISyntaxFacts helpers) of an node of type of type <typeparamref name="TSyntaxNode"/>.
/// - Token whose direct parent of type <typeparamref name="TSyntaxNode"/> is selected.
/// - Wanted node is an expression / argument and curent empty selection is within such syntax node (arbitrarily deep) on its first line.
/// - Selection is zero-width and wanted node is an expression / argument with selection within such syntax node (arbitrarily deep) on its first line.
/// - Whole node of a type <typeparamref name="TSyntaxNode"/> is selected.
