in src/main/kotlin/com/github/mkartashev/hserr/toolwindow/HsErrToolWindowFactory.kt [232:236]
override fun selectionChanged(event: FileEditorManagerEvent) {
val newFile = event.newFile ?: return
val editor = if (event.newEditor is TextEditor) (event.newEditor as TextEditor).editor else null
maybeUpdateUI(newFile, editor)
}