update.go

	case gxui.KeyBackspace, gxui.KeyDelete:
		var edits []input.Edit
		selections := editor.Controller().Selections()
		for _, s := range selections {
			if s.Start() < 0 {
				continue
			}
			edit := input.Edit{
				At:  s.Start(),
				Old: ctrl.TextRunes()[s.Start():s.End()],
			}
			if s.Start() == s.End() {
				if ev.Key == gxui.KeyBackspace {
					if edit.At == 0 {
						continue
					}
					edit.At--
				}
				edit.Old = ctrl.TextRunes()[edit.At : edit.At+1]
			}
			edits = append(edits, edit)
		}
		if len(selections) == 1 && selections[0].Start() >= 0 {
			pos := selections[0].Start()
			e.Apply(focused, edits...)
			editor.Controller().SetCaret(pos)
			editor.List.SetScrollOffset(editor.StartOffset())
		} else {
			e.Apply(focused, edits...)
		}