The tabledrag functionality does not allow avoiding a child item to become a root item. This is very useful when there is a differentiation between the root level items, and the ones below. If we have, say, type A and type B, and the business logic implies all B items MUST be children of A items, there is currently no way to allow A items do be drag only among it's sibling A items and at the same time have B items only be draggable inside the A items.
Define an attribute to limit the min-depth of a row (and perhaps max-depth also?), making it never move to the side of it's parent leveling.
Perhaps adding the same functionality but for max-depth.
// Define a row's minimum depth.
$form['table'][$row->id()]['#attributes']['data-tabledrag-min-depth'] = 1;
Needs work
10.1 ✨
The change is currently missing an automated test that fails when run with the original code, and succeeds when the bug has been fixed.
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Patch 3002325-12.patch is not compatible with version 9.5.3.
I have created an updated patch compatible with 9.5.3.
Was previously tagged for tests which still need to happen.