All task priority is always Medium in To Do
window, and changing the priority in option window
does not affect to To Do window for each tasks.

to reproduce;
 1. In Option window, expand [Editing] and select
[To Do Setting].
 3. Click [...] of Task Tags field.
 4. Change @todo priority to high priority.
 5. Close Option window, and add @todo in a
comment block of a class.
 6. Select [Window] -> [To Do].
 7. Right-click on ToDo window, and select [List
Options],[Change Visible Columns...].
 8 Check [Priority] check box, and click [OK].
 6. The priority for @todo tag is Medium in To Do
Window and not able to change.