Bugfix/765: Fixed stack overflow error for line-marker providers

[bohdan-harniuk]

Description (*)

Fixed stack overflow error for the next line-marker providers:

• com.magento.idea.magento2plugin.linemarker.php.PluginLineMarkerProvider
• com.magento.idea.magento2plugin.linemarker.php.PluginTargetLineMarkerProvider
• com.magento.idea.magento2plugin.linemarker.php.WebApiLineMarkerProvider

The bug was successfully reproduced by the next steps:

1. created new class A
2. created new class B
3. added plugins for class A
4. made class A extends class B
5. made class B extends class A

The results after fixing it:

Fixed Issues (if relevant)

1. Fixes [Bug] StackOverflowError exception in the PluginLineMarkerProvider #765

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 integration/functional tests (if applicable)
• All automated tests passed successfully (all builds are green)

[andrewbess]

Hello @bohdan-harniuk
Thank you for your contribution
Approved ✔️