[FIX] website_sale_wishlist: prevent flicker and make tour deterministic

Before this commit, there was a slight chance that the "add to wishlist" button
would flicker `disabled` off, which caused the tour to go next step too early.

The flicker was because the `_onChangeVariant` could be triggered by the
`website_sale` code before the variable `this.wishlistProductIDs` was actually
set, so it wrongly computed the state and enabled the button.

Now the RPC is done on the `willStart` instead of `start` to solve this issue.

The tour has been edited to check the button is actually disabled initially.

The view has been edited because the existing condition was too lazy: it checked
if any variant of the current template was in the wishlist, instead of checking
for the variant actually displayed. That also caused a flicker when the JS
correctly computed the state for the variant afterwards.

The widget has also been edited to trigger `input.product_id` instead of
`input.js_variant_change:checked` to avoid calling `get_combination_info` twice
from `website_sale` code.

PR: #29675
task-1920036

0 files changed, 0 insertions, 0 deletions