类型 TextState

type TextState struct {
	// SelectionReversed preserves the moving end of a backwards selection.
	SelectionReversed bool
	Value             string
	Selection         TextRange
	Composition       TextRange
	Composing         bool
	// Redraw asks for a frame after the event although the editor looks the same,
	// because the application changed something else in response. A terminal
	// uses it when typed text appears ahead of the server's echo; ordinary
	// terminal input leaves it false and costs no frame.
	Redraw bool
}