Ensure LoadPrevMsgMulti returns skip in LoadPrevMsg handoff, add test

Signed-off-by: Neil Twigg <neil@nats.io>

Author: neilalexander

server/filestore.go

@@ -8576,8 +8576,15 @@ func (fs *fileStore) LoadPrevMsgMulti(sl *gsl.SimpleSublist, start uint64, smp *
 	}
 
 	if sl == nil || sl.MatchesFullWildcard() {
-		sm, err = fs.LoadPrevMsg(start, smp)
-		return
+		if sm, err = fs.LoadPrevMsg(start, smp); err == nil {
+			return sm, sm.seq, nil
+		}
+		if err == ErrStoreEOF {
+			fs.mu.RLock()
+			defer fs.mu.RUnlock()
+			return nil, fs.state.FirstSeq, err
+		}
+		return nil, 0, err
 	}
 	fs.mu.RLock()
 	defer fs.mu.RUnlock()

server/store_test.go

@@ -20,6 +20,7 @@ import (
 	"os"
 	"path/filepath"
 	"reflect"
+	"slices"
 	"testing"
 	"time"
 
@@ -785,6 +786,48 @@ func TestStoreMsgLoadPrevMsgMulti(t *testing.T) {
 	)
 }
 
+func TestStoreMsgLoadPrevMsgMultiFullWildcardSkip(t *testing.T) {
+	testAllStoreAllPermutations(
+		t, false,
+		StreamConfig{Name: "zzz", Subjects: []string{"foo.*"}},
+		func(t *testing.T, fs StreamStore) {
+			for i := range 10 {
+				subj := fmt.Sprintf("foo.%d", i+1)
+				_, _, err := fs.StoreMsg(subj, nil, []byte("ZZZ"), 0)
+				require_NoError(t, err)
+			}
+
+			var sm StoreMsg
+			var state StreamState
+			fs.FastState(&state)
+
+			sl := gsl.NewSimpleSublist()
+			require_NoError(t, sl.Insert(">", struct{}{}))
+
+			var got []uint64
+			for seq := state.LastSeq; ; {
+				smp, nseq, err := fs.LoadPrevMsgMulti(sl, seq, &sm)
+				if err == ErrStoreEOF {
+					require_Equal(t, nseq, state.FirstSeq)
+					break
+				}
+				require_NoError(t, err)
+				require_Equal(t, smp.seq, nseq)
+				got = append(got, nseq)
+				if nseq == state.FirstSeq {
+					_, nseq, err = fs.LoadPrevMsgMulti(sl, nseq-1, &sm)
+					require_Error(t, err, ErrStoreEOF)
+					require_Equal(t, nseq, state.FirstSeq)
+					break
+				}
+				seq = nseq - 1
+			}
+
+			require_True(t, slices.Equal(got, []uint64{10, 9, 8, 7, 6, 5, 4, 3, 2, 1}))
+		},
+	)
+}
+
 func TestStoreGetSeqFromTimeWithInteriorDeletesGap(t *testing.T) {
 	testAllStoreAllPermutations(
 		t, false,