deleting nested inline editable matrix blocks and updating field layout

[i-just]

Description

Steps to reproduce:

• create a matrix field (innerMatrix) with at least one field in it; view mode: inline-editable blocks;
• create a second matrix field (outerMatrix) that contains the innerMatrix field; view mode: inline-editable blocks;
• create a section with an entry type that contains the outerMatrix field
• create an entry in that section (it can be fully saved)
• edit that entry and add at least one outerMatrix entry; in that entry create at least one innerMatrix entry
• delete the outerMatrix entry
• observe a 400 error from the elements/update-field-layout action about the element id being invalid

This happens because the entries are marked as deleted but their UIDs are passed to the elements/update-field-layout action. Since they’re already deleted, they cannot be found and the error is triggered.

Solution:
As a last resort, check for trashed elements (by uid) too.

Related issues

#16540