Strange selection behavior of with ExtendedSelection + SelectRows

Found this bug on a stackoverflow post.

The selection behaves different depending on whether a row is selected by clicking on the vertical header or by clicking the cell. This is due to the fact that QTableViewPrivate::selectRow() is using an own variable to remember the start of the selection (rowSectionAnchor) whereas QAIV is using currentSelectionStartIndex.

To reproduce to issue execute the attached testcase. Then do the following steps:

• click on the 2nd header entry - the column is selected
• press and hold shift and click on the header on the 3rd column - 2nd and 3rd columns are selected
• press and hold shift and click on the cell in the 4th column - now surprisingly the 2nd column gets deselected and only the 3rd and 4th column are selected
• press and hold shift and click the header on the 5th column and suddenly all 4 columns (2-5) are selected