[OU-FIX] project_todo: pre-migrate path collision on ir.actions.act_window

19.0 adds the `path` column on `ir.actions.act_window` with a unique
constraint and the schema upgrade pre-populates `path='to-do'` on
`project_todo.project_task_action_todo`. When the module's data XML
then `_load_records()` re-writes the same row with `path='to-do'`, the
@api.constrains check finds the record's own existing value as a
duplicate of itself and raises `Path to show in the URL must be unique`,
aborting the migration at `project_todo/views/project_task_views.xml:277`.

Null the column in pre-migration so the install path can re-set it
cleanly.

Author: dnplkndll

docsource/modules180-190.rst

@@ -956,7 +956,7 @@ Module coverage 18.0 -> 19.0
 +---------------------------------------------------+----------------------+-------------------------------------------------+
 | project_timesheet_holidays                        |                      |                                                 |
 +---------------------------------------------------+----------------------+-------------------------------------------------+
-| project_todo                                      |                      |                                                 |
+| project_todo                                      |Done                  |                                                 |
 +---------------------------------------------------+----------------------+-------------------------------------------------+
 | purchase                                          |Done                  |                                                 |
 +---------------------------------------------------+----------------------+-------------------------------------------------+

openupgrade_scripts/scripts/project_todo/19.0.1.0/pre-migration.py

@@ -0,0 +1,17 @@
+from openupgradelib import openupgrade
+
+
+@openupgrade.migrate()
+def migrate(env, version):
+    """Null ``path`` on the todo action, as the schema upgrade pre-populates
+    it and the module data XML then trips the unique constraint on its own
+    row.
+    """
+    openupgrade.logged_query(
+        env.cr,
+        """
+        UPDATE ir_act_window
+           SET path = NULL
+         WHERE path = 'to-do'
+        """,
+    )