in Sources/TwitterTextEditor/TextEditorView.swift [1773:1783]
func textView(_ textView: TextView,
didChangeBaseWritingDirection writingDirection: NSWritingDirection,
forRange range: UITextRange)
{
// `NSWritingDirection` enum name can't be described by `String(describing:)`.
log(type: .debug, "base writing direction: %d, range: %@", writingDirection.rawValue, range)
updatePlaceholderTextScheduler.schedule()
textInputObserver?.textEditorView(self, didChangeBaseWritingDirection: writingDirection)
}