title: Is it possible to set the text of the QTableView corner button?
body: <p>QTableView has a <a href="http://qt-project.org/doc/qt-5/qtableview.html#cornerButtonEnabled-prop" rel="nofollow">corner button</a>, occupying the intersection between the horizontal and the vertical header. Clicking this will select all cells in the table. What I'm wondering is if it's possible to set this button's text, and if so, how?</p>