Release v3.4.0 · M-Igashi/mp3rgain

Highlights

New -s R mode: apply gain from stored ReplayGain tags without rescanning (#298, #300). Track mode (-r) reuses stored REPLAYGAIN_TRACK_* values per file and re-analyzes only files whose tags are missing. Album mode (-a) reuses tags when every file carries a consistent album set, and rescans the whole album otherwise. This restores mp3gain's default behavior as an opt-in and makes re-applying gain to an already-tagged library dramatically faster. Reuse is skipped (with a notice) for -s r, -d/-m modifiers, and --rg2/--r128. Thanks to @ToxicFrog for the report and design discussion.
The GUI no longer dies silently on a panic (#297, #301). mp3rgui now installs a log-first panic hook: the panic message and location are written to stderr and to panic.log in the app data directory, and main-thread panics additionally show an error dialog pointing at the log and the issue tracker. Previously a panic on Windows (no console) meant the window just vanished with nothing to report.

The Windows GUI installer is now also published under the version-free name mp3rgui-windows-setup.exe, so the download link stays stable across releases (b271acd)
PPA packages now target Ubuntu resolute (26.04 LTS); questing (25.10) reached end of life and no longer accepts uploads (2bbad4c)
winget keeps the GUI on the portable zip rather than switching to the Inno installer, avoiding an untested install-type transition for existing winget users (da0da46)
Packaging follow-ups for 3.3.0: winget manifests, MacPorts Portfile, and AUR mp3rgui updates (410fc97, 04ac3e9, b401f3a)
CI: GitHub Actions dependency bumps (#299)

Full Changelog: v3.3.0...v3.4.0