TextInput positionToRectangle doesn't return correct coordinates for the cursor in pre-edit mode

Run the attached QML application

1. Set cursor to end of the textInput "preedittext2". Red box indicates the position returned by positionToRectangle.
2. (bug no.1) press backspace. Indicator jumps to beginning of the pre-edit text, excepted outcome in this situation would be the cursor position.
3. (bug no.2) press space. Indicator isn't updated to cursor position. This is because the text input has to scroll the text after pressing space.