I would like to clean up XAML files as I work on them. It would be really helpful and educational if you could see what the default values are for properties when you set them - e.g. that RowDefinition.Height is * by default, so you don't need to specify it. I realize that some properties can be affected by styles, but I am sure it can be determined what's the default based on the code.
You might want to take a look at the GammaXaml plugin (http://gjxaml.codeplex.com/) which I think offers this kind of analysis.
Thanks, that looks promising and it seems like you do implement features that were in that pluging before, so I am hoping this might show up in future versions of R# too!