Hi, I created a small test project to demonstrate this bug. When drawing a QTableView widget with Fusion style, the right border of the last visible column header becomes 2 pixel wide if the last column of the model is not visible.
Maybe the attached project and images will help to explain this issue better, basically, if you hide the last column of the model, the right border becomes larger. Not a big issue, but can lead to inconsistencies in the application's overall look.