Expanding a tree view with alternative row colors looks bad

[christophe-thiery-fw]

• Set alternatingRowColors to true on a QTreeView.
• Expand a parent whose number of children is odd. -> Rows below the expanded rows switch background colors after the expanding animation is over. I would expect them to update to correct colors as soon as the animation starts.

Here is a video in the sandbox. The problem is however more annoying with more rows and more contrasting colors. https://github.com/oclero/qlementine/assets/36953703/5c4152ee-6913-49f2-abd6-d81272c7819f