Textinput&Textedit: Button "Select None" cannot work well

Precondition:
textinput.qml and textedit.qml import QtQuick1.0

Reproduction Steps:
1. execute textinput.qml and textedit.qml using qmlviewer
2. enter "Hello World" into text field
3. press button "Select All"
4. press button "Select None"

Expected Results:
the texts "Hello World" in the text field is not in slected status.

Actual results:
the texts "Hello World" in the text field is still in slected status.