The WPF app showed the disassembled IL header when hovering a member
reference in IL view, and the opcode's XML documentation when hovering
an instruction. The Avalonia port lost both: ILLanguage fell back to
the base ambience one-liner and the opcode tooltip carried only the
name and encoding. Opcode docs additionally need a modern-.NET source:
the WPF code read the .NET Framework reference-assembly docs, which do
not exist on modern .NET, so MscorlibDocumentation now falls back to
the ref pack parallel to the hosting runtime.
Assisted-by: Claude:claude-fable-5:Claude Code
XmlDocLoader's modern-.NET fallback built the ref-pack path from the EXACT runtime
patch version (shared/Microsoft.NETCore.App/10.0.8 -> packs/Microsoft.NETCore.App.Ref/
10.0.8/ref), but the targeting (ref) pack version usually differs from the installed
runtime patch -- e.g. pack 10.0.0 -- and a relocated CI install (DOTNET_INSTALL_DIR)
may carry only a different feature band. The exact-version lookup then missed and the
provider came back null, leaving CoreLib hovers undocumented. Broaden the search:
prefer an exact match, then the newest pack sharing the runtime's major.minor, then
the newest pack present.
Assisted-by: Claude:claude-opus-4-8:Claude Code
Promotes the modern .NET XML-doc lookup from the Avalonia port into the
shared ICSharpCode.Decompiler library so every host (WPF, Avalonia, any
third-party consumer of XmlDocLoader) gets hover/tooltip documentation
for system entities without per-host fallback wiring.