Incorrect tax calculations when multiple taxes applied to an order

This was originally reported at http://www.ubercart.org/forum/bug_reports/13328/tax_problem_v18 by rickyw.

Discussion and a solution is at http://www.ubercart.org/forum/support/13352/taxes_not_showing_after_upgr....

For convenience, here is the solution:

In module uc_taxes_workflow.inc, function uc_taxes_save_line_item (at the bottom of the file), change:

$_SESSION['taxes'][$line_item->id] = (array)$line_item;

to

$_SESSION['taxes'][$line_item['id']] = (array)$line_item;

There is no $line_item->id, so each time a new tax is written, it overwrites whatever was stored there before.