The dataChanged Signal Not Performing as Expected

[d_stranz]

A mouse move triggers a repaint of the underlying cell

My testing (setting a breakpoint in data() of my tree model) shows that a mouse move does not trigger a fetch of new data unless mouse tracking is enabled and the mouse passes over a tree item. If mouse tracking in not enabled or if the mouse is moving over an empty area of the tree view, only a mouse click or other action that triggers a repaint (eg. moving the window containing the tree view) will cause a data fetch.

[ChristianEhrlicher]

That's exactly what I said. And when you've a style which highlights the cell with the mouse focus the even every mouse move will update the underlying cell (e.g. fusion style on linux)