Layout issues in simplified ribbon

[pschimmel]

Hi!

I really like the idea of having an alternative, simplified ribbon layout.
I tried the new version 9.0.0 with attached project. I've not tested intensively, but already found some issues:

FluentTest.zip

The classic layout looks like this:

After switching to simplified ribbon, it looks like this:

On first sight, the galleries look wrong to me.
After resizing the window, the galleries change to a button with dropdown:

Buttons that have a wide header in classic style remain as wide as before after changing to simplified ribbon:

And finally when looking closer, you can see that the lower border of the mouse over highlighting is clipped: