https://github.com/CodeEditApp/CodeEditTextView/blob/9b300d8a37589f4e16719f98d1bf8763940ef0b2/Sources/CodeEditTextView/STTextViewController.swift#L182

Here, this line will be always executed whenever 'Tab' key is pressed, e.g. if the focus is on a other tab or command palette, all open tabs will insert a tab space.

textView?.insertText(String(repeating: " ", count: tabWidth))