[FIX] web_editor, website, *: improve post install theme and start tour

Before this commit, once you install website_* module, the ir.actions.todo from
the installed module was overidded by the 'choose a theme' action.

Now, when we consume this ir_act_todo, we re-open the open_menu that contains
most of the time the expected next action from new module installed.

Since we can also install module from the '+ new' button, in frontend, we
considere that it first step of tour is to click on it, it is already done and
we skip it.

Install website_event
Before:
   -> not redirected to /event (the ir.action.todo)
   -> no tour, if you don't click manually on '+ new'

After:
    -> you are redirected to /event
    -> you can launch tour from '+ new' if you are already on the new panel,
       start direclty to the second step 'create event'

1 files changed, 15 insertions, 0 deletions

diff --git a/addons/website/models/ir_actions.py b/addons/website/models/ir_actions.py
index 24fbc937514..305820503c7 100644
--- a/addons/website/models/ir_actions.py
+++ b/addons/website/models/ir_actions.py
@@ -60,3 +60,18 @@ class ServerAction(models.Model):
         """
         res = super(ServerAction, self)._run_action_code_multi(eval_context)
         return eval_context.get('response', res)
+
+
+class IrActionsTodo(models.Model):
+    _name = 'ir.actions.todo'
+    _inherit = 'ir.actions.todo'
+
+    def action_launch(self):
+        res = super().action_launch()  # do ensure_one()
+
+        if self.id == self.env.ref('website.theme_install_todo').id:
+            # Pick a theme consume all ir.actions.todo by default (due to lower sequence).
+            # Once done, we re-enable the main ir.act.todo: open_menu
+            self.env.ref('base.open_menu').action_open()
+
+        return res