tracking: read the ledger's version, not just write it; clear owned on any block; channel-correct prune recovery

src/shell/persist/session.cpp

@@ -35,6 +35,7 @@
 #define REAPERAPI_MINIMAL
 #define REAPERAPI_WANT_MarkProjectDirty
 #define REAPERAPI_WANT_SetProjExtState
+#define REAPERAPI_WANT_ShowConsoleMsg
 #include "reaper_plugin_functions.h"
 
 namespace reasampler {
@@ -56,7 +57,18 @@ void ReaSamplerSession::recordCreated(const model::Sample& sample,
     // rather than re-deriving keeps one source for the lineage fact. Absent
     // provenance is a root capture, not a gap.
     if (sample.provenance) rec.parentSampleId = sample.provenance->parentSampleId;
-    tracking_.record(rec);
+
+    const tracking::RecordResult result = tracking_.record(rec);
+    // A rejection means a file exists that nothing attributes to us — invisible
+    // otherwise, and exactly the gap this ledger exists to close. AlreadyPresent is
+    // the normal dedup outcome, not a gap.
+    if (result == tracking::RecordResult::RejectedEmptyPath ||
+        result == tracking::RecordResult::RejectedAbsolutePath) {
+        ShowConsoleMsg(("ReaSampler: could not record the origin of '" +
+                        sample.relativePath +
+                        "' -- the path is empty or absolute. The file is NOT tracked and "
+                        "prune will treat it as a foreign file.\n").c_str());
+    }
 }
 
 bool ReaSamplerSession::consumeLoadSignal() {