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Created attachment 2150 [details]
Patch to fix problem
Quite often, while browsing an assembly, it'll fail with "Failed to resolve type". One easy way to reproduce the problem is to open up Mono's System.Windows.Forms, and try to browse the top level of the Application class -- it'll fail to resolve the System.ComponentModel.EditorBrowsableState enum.
In any case, after digging through the code for a while, the fix was easy -- it's a bug in SimpleAssemblyResolver.InternalResolve(). After it reads as assembly, it doesn't double-check that the assembly's FullName matches the one it's looking for.
In the above example, it was looking for "System, Version=220.127.116.11, Culture=neutral, PublicKeyToken=b77a5c561934e089" and instead found "System.ComponentModel.DataAnnotations, Version=18.104.22.168, Culture=neutral, PublicKeyToken=31bf3856ad364e35", and put that in the cache. Needless to say, hilarity ensues.
The enclosed patch fixes the problem.
There's another call to ReadAssembly() a few lines later, but I don't understand the code well enough to speculate on whether this fix is applicable there.
Thanks for the fix.