Change Details

Todos: * Update theme files for new editor type. * Improve listeners in `space_spreadsheet.cc`. {F9856497}

This implements the initial spreadsheet editor for T85879. Todos: * Update theme files for new editor type. * Improve listeners in `space_spreadsheet.cc`. {F9856497}

This implements the initial spreadsheet editor for T85879. Todos: * Update theme files for new editor type. * Improve listeners in `space_spreadsheet.cc`. {F9856497}