Fix category tree in cart price rule #17493

[magently]

Description

Currently if you try to create a catalog price rule based on categories with nesting level 4 or higher (1 being the Default Category), these categories (despite being correctly saved in the condition) won't have their corresponding checkboxes checked when you open the Category Chooser again.

Fixed Issues (if relevant)

1. Catalog Rule & Selected Categories with level > 3 #17493

Manual testing scenarios

1. Open form for creating a new Catalog Rule
2. Under Condition select Product Attribute -> Category
3. Open Category Chooser
4. Select one Category with level = 1, 2 or 3
5. Select at least one Category with level > 3 (4, 5, ...)
6. Click ok & close Category Chooser
7. Open again Category Chooser and see
   that only categories with level <= 3 are selected
   and category with level > 3 without selection

Point 5 is now fixed. All the previously chosen categories have their corresponding checkboxes checked after reopening Category Chooser.

Contribution checklist

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds on Travis CI are green)

[magento-engcom-team]

Hi @magently. Thank you for your contribution
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[slavvka]

Hi @magently, we need the fix to be delivered also to 2.3-develop branch so please don't forget to port this PR to 2.3-develop; you can do it easily using the Porting Tool, https://devdocs.magento.com/guides/v2.2/contributor-guide/contributing.html#porting-tool

[magently]

Hi @magently, we need the fix to be delivered also to 2.3-develop branch so please don't forget to port this PR to 2.3-develop; you can do it easily using the Porting Tool, https://devdocs.magento.com/guides/v2.2/contributor-guide/contributing.html#porting-tool

Sure. We will port it as soon as this PR gets merged.

[magento-engcom-team]

Hi @magently. Thank you for your contribution.
We will aim to release these changes as part of 2.2.8.
Please check the release notes for final confirmation.

Please, consider to port this solution to 2.3 release line.
You may use Porting tool to port commits automatically.