Test OK.
And thks again. Very useful addition.

I have tested this item ✅ successfully on d9ff35b

I have testet #8578 article layout override from category-blog

Similar problems as in my post in #8579

To solve this it is additional or changed code required.

Please wait here before merging, there is something with overwrites and blog layouts, I can remember there was some strange magic but I have to look to find the details

At least I, and maybe some more user, would become confused in the case my subcategories and/or articles have their own menu items. This override will then (hopefully) not be in charge.
The idea is good, but the usecase is a bit limited I think.
It needs a lot of testing with different usecases not only a simple blog.

Successfully tested.

I have tested this item 🔴 unsuccessfully on d9ff35b

Now i testet this PR more with this Problem:

Make all that you have an article-category-blog-menuitem with Alternative Layout (for Article) that work how expected with the PR.
Then go to this article-category-blog-menuitem -> Details -> Template Style and change to an other Template with Template-Override
( with a not default name of the override(unique name) ; for example: /html/com_content/article/my-66-override.php )

Then go in the article-category-blog-menuitem to Blog Layout -> Alternative Layout and see the not correct list in.
Then click the "Save"-Button and go back to Blog Layout -> Alternative Layout and see the correct list now.

Now select this override "my-66-override" and save it.
Now the PR works as expected but if you now go again to
article-category-blog-menuitem -> Details -> Template Style and change to an other Template and save it.

Then works the override furthermore (not expected).

If you now go to the article-category-blog-menuitem to Blog Layout -> Alternative Layout and change this to "From Component -> default" and save it then is come the expected result(view without the override from the other Template).

I hope this is helpful.

@brianteeman can you move this back to pending as i'm unable to do that via the tracker as we have problems there.

@rdeutz #8578#event-192412

With the PR 14802 comes in the Options-Tab of the Article-Category-Blog-menuitem already the
Choose a Layout.

Is no need to add with PR 8578 the same function in the
Blog-Layout-Tab of the Article Category Blog-menuitem.

I think we can close PR 8578

Problem in PR8578 is the similar same problem as with #14802 that i have write in issue
#17912

Set to "closed" on behalf of @franz-wohlkoenig by The JTracker Application at issues.joomla.org/joomla-cms/8578

closed as stated above.