Added test and implemented working fix

integration_test.go

@@ -14,6 +14,7 @@ import (
 	"path"
 	"path/filepath"
 	"runtime"
+	"strings"
 	"sync"
 	"sync/atomic"
 	"testing"
@@ -1259,6 +1260,59 @@ func TestCloseRace(t *testing.T) {
 	}
 }
 
+func TestMoveWatchedDirectory(t *testing.T) {
+	testDir := tempMkdir(t)
+	defer os.RemoveAll(testDir)
+
+	watcher := newWatcher(t)
+
+	// event recording
+	var events []Event
+	go func() {
+		for {
+			event, ok := <-watcher.Events
+			if !ok {
+				return
+			}
+			events = append(events, event)
+		}
+	}()
+
+	addWatch(t, watcher, testDir)
+
+	dir1 := filepath.Join(testDir, "dir")
+	dir2 := filepath.Join(testDir, "dir2")
+
+	if err := os.Mkdir(dir1, 0o775); err != nil {
+		t.Fatal(err)
+	}
+	time.Sleep(10 * time.Millisecond)
+	addWatch(t, watcher, dir1)
+	if err := os.Rename(dir1, dir2); err != nil {
+		t.Fatal(err)
+	}
+
+	time.Sleep(10 * time.Millisecond)
+	err := ioutil.WriteFile(filepath.Join(dir2, "file.ext"), []byte(""), 0o664)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if err := watcher.Close(); err != nil {
+		t.Fatal(err)
+	}
+
+	time.Sleep(10 * time.Millisecond)
+	if len(events) != 4 {
+		t.Fatalf("Expected 4 events. Got: %d", len(events))
+	}
+
+	expectedSuffix := filepath.Join("dir2", "file.ext")
+	if !strings.HasSuffix(events[3].Name, expectedSuffix) {
+		t.Fatalf("Expected suffix %s, Got: %s", expectedSuffix, events[3].Name)
+	}
+}
+
 func testRename(file1, file2 string) error {
 	switch runtime.GOOS {
 	case "windows", "plan9":

windows.go

@@ -504,9 +504,11 @@ func (w *Watcher) readEvents() {
 
 				// update saved path of all sub-watches
 				oldFullName := filepath.Join(watch.path, watch.rename)
-				for _, otherWatch := range w.watches {
-					if strings.HasPrefix(otherWatch.path, oldFullName) {
-						otherWatch.path = filepath.Join(watch.path, strings.TrimPrefix(otherWatch.path, oldFullName))
+				for _, watchMap := range w.watches {
+					for _, otherWatch := range watchMap {
+						if strings.HasPrefix(otherWatch.path, oldFullName) {
+							otherWatch.path = filepath.Join(fullname, strings.TrimPrefix(otherWatch.path, oldFullName))
+						}
 					}
 				}