Unexpected shift-selection in QTreeView.

When using selectionModel()->setCurrentIndex() to move the anchor to another position, then pressing the Shift key and clicking on an index to select a range of data, the selected items are not as expected.

To reproduce the issue:

• Run the attached example project.
•  Click  the index at 5.
• Press cntrl + G , and enter 2 then click OK.
• Press shift key and click index = 4.

 Expected outcome: select from 2~4.
Actual outcome:  select  5 to 4.

As a workaround, uncomment line 27 and comment out line 26 in main.cpp.