insert_column with existing styled cell doesn't set cell @worksheet, causing failure in LegacyCell#validate_worksheet #441

c = RubyXL::Cell.new(:style_index => old_cell.style_index, :worksheet => self,
                     :row => row_index, :column => column_index,
                     :datatype => RubyXL::DataType::SHARED_STRING)

#!/usr/bin/env ruby

require 'rubyXL'
require 'rubyXL/convenience_methods'

worksheet = RubyXL::Workbook.new.worksheets[0]

cell = worksheet.add_cell(0, 0, 'test 1')
cell.change_font_bold(true)
added_cell = worksheet[0][0]
added_cell_ws = added_cell.instance_variable_get(:@worksheet)

worksheet.insert_column(0)
inserted_cell = worksheet[0][0]
inserted_cell_ws = inserted_cell.instance_variable_get(:@worksheet)

# Uncomment to see the underlying problem
# puts "original worksheet:       #{worksheet || '<nil>'}"
# puts "added cell @worksheet:    #{added_cell_ws || '<nil>'}"
# puts "inserted cell @worksheet: #{inserted_cell_ws || '<nil>'}"

added_cell.change_contents('test 2')
inserted_cell.change_contents('test 3')