fix(watch): capture Windows file identity before external moves

internal/watch/snapshot_unix.go

@@ -0,0 +1,7 @@
+//go:build !windows
+
+package watch
+
+import "os"
+
+func snapshotInfo(path string) (os.FileInfo, error) { return os.Stat(path) }

internal/watch/snapshot_windows.go

@@ -0,0 +1,16 @@
+package watch
+
+import (
+	"errors"
+	"os"
+)
+
+func snapshotInfo(path string) (os.FileInfo, error) {
+	file, err := os.Open(path)
+	if err != nil {
+		return nil, err
+	}
+	// File.Stat captures the file ID from its open handle, before external renames.
+	info, err := file.Stat()
+	return info, errors.Join(err, file.Close())
+}

internal/watch/watch.go

@@ -10,6 +10,7 @@ import (
 	"os"
 	"path/filepath"
 	"rawmark/internal/i18n"
+	"runtime"
 	"sort"
 	"strings"
 	"time"
@@ -135,8 +136,18 @@ func (w *Watcher) scan() (map[string]fileState, error) {
 	next := make(map[string]fileState, len(entries))
 	dirs := map[string]bool{w.v.Root(): true}
 	for _, e := range entries {
-		st := fileState{dir: e.Dir, size: e.Size, mtime: e.Info.ModTime().UnixNano(), info: e.Info}
 		abs := filepath.Join(w.v.Root(), filepath.FromSlash(e.Path))
+		info := e.Info
+		if runtime.GOOS == "windows" {
+			info, err = snapshotInfo(abs)
+			if errors.Is(err, fs.ErrNotExist) {
+				continue
+			}
+			if err != nil {
+				return nil, err
+			}
+		}
+		st := fileState{dir: e.Dir, size: info.Size(), mtime: info.ModTime().UnixNano(), info: info}
 		if e.Dir {
 			dirs[abs] = true
 		} else if vault.IsNote(e.Path) {

internal/watch/watch_test.go

@@ -42,6 +42,9 @@ func TestUnreadableNotePreservesSnapshot(t *testing.T) {
 		t.Fatal(err)
 	}
 	allowRead := testutil.DenyRead(t, p)
+	if _, err := os.ReadFile(p); err == nil {
+		t.Fatal("filesystem failure fixture did not block reading")
+	}
 	w.rescan()
 	if w.snap["note.md"].rev != old || scans != 0 {
 		t.Fatal("读取失败不能提交不完整快照或更新索引")
@@ -69,7 +72,7 @@ func TestDiff(t *testing.T) {
 		}
 	}
 	state := func(p, rev string) fileState {
-		info, err := os.Stat(filepath.Join(root, p))
+		info, err := snapshotInfo(filepath.Join(root, p))
 		if err != nil {
 			t.Fatal(err)
 		}
@@ -125,7 +128,7 @@ func TestDirectoryMovesCoverChildrenAndEmptyDirectories(t *testing.T) {
 	snapshot := func(dir string) map[string]fileState {
 		out := map[string]fileState{}
 		for _, rel := range []string{dir, dir + "/empty", dir + "/a.md"} {
-			info, err := os.Stat(filepath.Join(root, rel))
+			info, err := snapshotInfo(filepath.Join(root, rel))
 			if err != nil {
 				t.Fatal(err)
 			}
@@ -170,7 +173,7 @@ func TestImageReplacementRefreshesTree(t *testing.T) {
 	if err := os.WriteFile(p, []byte("image"), 0o644); err != nil {
 		t.Fatal(err)
 	}
-	info, err := os.Stat(p)
+	info, err := snapshotInfo(p)
 	if err != nil {
 		t.Fatal(err)
 	}