fzf: update charlievieth/fastwahk and use forward-slashes on WSL

This commit changes FZF to enforce that all paths are joined with
forward-slashes when running on WSL (Windows Subsystem for Linux)
even when the FZF binary was compiled for Windows.

Update: github.com/charlievieth/fastwalk to v1.0.5
Fixes:  #3859

go.mod

@@ -1,7 +1,7 @@
 module github.com/junegunn/fzf
 
 require (
-	github.com/charlievieth/fastwalk v1.0.4
+	github.com/charlievieth/fastwalk v1.0.6
 	github.com/gdamore/tcell/v2 v2.7.4
 	github.com/mattn/go-isatty v0.0.20
 	github.com/mattn/go-shellwords v1.0.12

go.sum

@@ -1,5 +1,5 @@
-github.com/charlievieth/fastwalk v1.0.4 h1:EG3y5L1XBa8VftvpONuQlfe5sNuf1xzGpm59bdgCDwo=
-github.com/charlievieth/fastwalk v1.0.4/go.mod h1:JSfglY/gmL/rqsUS1NCsJTocB5n6sSl9ApAqif4CUbs=
+github.com/charlievieth/fastwalk v1.0.6 h1:C7nXgxQIjEkpKWT1fbXGFzQiblwqq2ZsxrR0ohh5IRs=
+github.com/charlievieth/fastwalk v1.0.6/go.mod h1:rV19+IF9Y2TYQNy4MqEk5M/spNHjKsA0i71yrsv2p4E=
 github.com/gdamore/encoding v1.0.0 h1:+7OoQ1Bc6eTm5niUzBa0Ctsh6JbMW6Ra+YNuAtDBdko=
 github.com/gdamore/encoding v1.0.0/go.mod h1:alR0ol34c49FCSBLjhosxzcPHQbf2trDkoo5dl+VrEg=
 github.com/gdamore/tcell/v2 v2.7.4 h1:sg6/UnTM9jGpZU+oFYAsDahfchWAFW8Xx2yFinNSAYU=

src/reader.go

@@ -235,8 +235,11 @@ func isSymlinkToDir(path string, de os.DirEntry) bool {
 
 func (r *Reader) readFiles(root string, opts walkerOpts, ignores []string, sep byte) bool {
 	r.killed = false
-	conf := fastwalk.Config{Follow: opts.follow}
-	replaceSep := sep != os.PathSeparator
+	conf := fastwalk.Config{
+		Follow: opts.follow,
+		// Use forward slashes when running a Windows binary under WSL.
+		ToSlash: fastwalk.DefaultToSlash(),
+	}
 	fn := func(path string, de os.DirEntry, err error) error {
 		if err != nil {
 			return nil
@@ -255,15 +258,7 @@ func (r *Reader) readFiles(root string, opts walkerOpts, ignores []string, sep b
 					}
 				}
 			}
-			bytes := stringBytes(path)
-			if replaceSep {
-				for i, b := range bytes {
-					if b == os.PathSeparator {
-						bytes[i] = sep
-					}
-				}
-			}
-			if ((opts.file && !isDir) || (opts.dir && isDir)) && r.pusher(bytes) {
+			if ((opts.file && !isDir) || (opts.dir && isDir)) && r.pusher([]byte(path)) {
 				atomic.StoreInt32(&r.event, int32(EvtReadNew))
 			}
 		}