QTableWidget - When first item has the flag "Qt::NoItemFlags" selecting/deselecting of a column does not work

Clicking on the header of a column starting with an item with "Qt::NoItemFlags" never deselects the items.

Was working with 4.5.3

Attached: test case to reproduce

KW: QTableView, QItemSelectionModel

Steps to reproduce:

• Run attached sample
• Click header "2" to highlight (select) the second column
• Click header "2" again to remove the selections
• EXPECTED: Selections are removed
• ACTUAL: Selections are not removed

Doing the same steps for Header "1" properly selects/deselects the items.