Smart Keys settings: YAML
Use this settings page to configure typing assistance features in YAML.
For more information about YAML support in PhpStorm, see YAML.
Auto expand key sequences upon paste
With this option selected, PhpStorm properly formats key sequences when you paste them from the clipboard. For example, the
Otherwise, if the option is cleared, key sequences are pasted from the clipboard "as is", hierarchy is not preserved, and consequently proper highlighting is not provided.