[FIX] project_issue_sheet: copy issue

- Create a project which handles Tasks and Issues
- Create an issue
- Book some timesheet on the issue, thanks to the tab "Timesheet"
- Go to the Timesheet application, you'll see that the time booked
  appears in the grid
- Change the time spent from the grid view.

The time added is booked on the issue, while the user doesn't expect it.

This is because the modification of a timesheet line copies an existing
line, then change the necessary values (see method `adjust_grid`).

Ideally, we should have a link module between timesheet grid and project
issue. Another solution would be some hack in the `timesheet_grid`
module to prevent `issue_id` to be copied. However, there is little to
no use of copying a timesheet line in general, so the solution chosen
should not affect the existing processes.

opw-697018

addons/project_issue_sheet/models/account_analytic_line.py

@@ -6,4 +6,4 @@ from odoo import fields, models
 class AccountAnalyticLine(models.Model):
     _inherit = 'account.analytic.line'
 
-    issue_id = fields.Many2one('project.issue', 'Issue')
+    issue_id = fields.Many2one('project.issue', 'Issue', copy=False)