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Siegfried Pammer
ffb39611b8
The Avalonia port dropped ILSpy's single-instance feature, leaving three inert surfaces behind: the --newinstance / --noactivate switches, and the "Allow multiple instances" option were parsed and persisted but never read, and every launch started a new process. The former WPF implementation also encoded the executable location in the mutex name, so two ILSpy builds at different paths never shared an instance. That broke the Windows "Open with ILSpy" shell command: it launches a fixed executable and would not reuse a running instance started from elsewhere. Reimplement it with portable primitives (named Mutex + named pipes, no P/Invoke): the first launch for a user takes the mutex and listens; a later launch forwards its arguments over the pipe and exits. The namespace is derived from machine + user only -- never the location -- so any launcher reuses the running instance. --instanceid is a runtime reuse filter matched against the running instance's actual executable identity (via Environment.ProcessPath, single-file-bundle safe), not part of the mutex name, so it never re-introduces the location partitioning it replaces. The VS add-in passes its bundled exe path as --instanceid to prefer its own build while still sharing with a plain launch of that same executable. Assisted-by: Claude:claude-opus-4-8:Claude Code
Test cases for various types of projects as well as corresponding test plans are located in a separate repository.