Bug 41454

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.