I can get each of the component's class (partial class) files to nest in the IDE's solution view under its .razor file, but it insists on going a step further and creating a hierarchical tree in this way:
(Note: partial class files aren't meant to be represented as a hierarchy, in case this wasn't obvious.)
None of the settings I've tried within the file nesting settings in Visual Studio have worked. I have even tried renaming the above files in a variety of ways. I'll have to just disable nesting, if this continues.