fix(vst): reopen heal without the editor — bounded main-thread retry timer, re-armable first-poll heal, unconditional preview-off consume + Mono/drain preview tests

src/vst/reasampler_processor.h

@@ -240,7 +240,32 @@ public:
     void previewNoteOn(int note);
     void previewNoteOff(int note);
 
+    // Reopen-heal retry tick — the target of the module-internal Win32 heal timer (see
+    // armHealRetry below), NOT host-facing. Public only because the file-static TIMERPROC
+    // in the .cpp must reach it. Main thread; re-runs reloadFromBank (which disarms the
+    // timer itself on success) and disarms when the bounded retry budget runs out.
+    void healTick();
+
 private:
+    // --- Reopen-heal retry (the NON-editor reload trigger) --------------------------
+    // A project-restored instance with intent (a selection or zones) can come up SILENT:
+    // REAPER runs track-FX setState before the extension's PROJEXTSTATE block is parsed,
+    // so the setState-time reload reads an empty bank. The editor's WM_TIMER poll heals
+    // that — but only if the user opens the editor; an instance played via host MIDI with
+    // the editor never attached stayed silent indefinitely. Mechanism: reloadFromBank
+    // itself detects "built NOTHING despite restored intent, bridge connected" (off the
+    // audio thread — it just tried) and arms a BOUNDED, HWND-less Win32 retry timer
+    // (SetTimer + TIMERPROC: fires on the arming thread's message pump — REAPER's main
+    // thread, where every reload path already runs). Each tick re-runs reloadFromBank,
+    // which disarms on success or when the intent is gone; the bound stops the churn for
+    // an instance whose WAV is genuinely missing. A deliberately-empty instance never
+    // arms (no intent). process() is untouched — fully RT-safe. Main-thread only.
+    // No-ops on non-Windows builds (the VST target is Windows-only).
+    void armHealRetry();
+    void disarmHealRetry();
+    std::uintptr_t healTimerId_ = 0;  // 0 = not armed (main thread only)
+    int healRetriesLeft_ = 0;         // remaining timer-tick retries (main thread only)
+
     // Phase S drain retirement (FA1-review Major #2): if process() has published that the
     // CURRENT drain instrument is fully idle (every engine voice silent),
     // move it out of the drain slot into the graveyard and prune — so an edited-away snapshot
@@ -356,7 +381,11 @@ private:
     // intent (a selection or zones) — the project-load ordering can run setState before the
     // extension's PROJEXTSTATE block is parseable, so the bridge read came back empty — the
     // first poll reloads instead of silently baselining, or the instrument would stay silent
-    // until some param change forced a reload. NOT read on the audio thread.
+    // until some param change forced a reload. If that heal reload STILL leaves nothing live,
+    // pollBankSync resets this back to the -1 sentinel so the next tick re-arms the heal —
+    // the retry is bounded by the intent check (a deliberately-empty instance never heals),
+    // and it also covers a bank whose generation counter was never bumped (0 != 0 can never
+    // fire the generation path). NOT read on the audio thread.
     std::int64_t lastSeenBankGeneration_ = -1;
 
     // S-VIEW-4 preview-trigger velocity (MIDI 1..127). Persisted in component state (v6) so the