lib/connections: Add QUIC protocol support (fixes #5377) (#5737)

lib/model/folder_sendrecv.go

@@ -9,7 +9,6 @@ package model
 import (
 	"bytes"
 	"fmt"
-	"math/rand"
 	"path/filepath"
 	"runtime"
 	"sort"
@@ -25,6 +24,7 @@ import (
 	"github.com/syncthing/syncthing/lib/ignore"
 	"github.com/syncthing/syncthing/lib/osutil"
 	"github.com/syncthing/syncthing/lib/protocol"
+	"github.com/syncthing/syncthing/lib/rand"
 	"github.com/syncthing/syncthing/lib/scanner"
 	"github.com/syncthing/syncthing/lib/sha256"
 	"github.com/syncthing/syncthing/lib/sync"
@@ -1089,10 +1089,7 @@ func (f *sendReceiveFolder) handleFile(file protocol.FileInfo, copyChan chan<- c
 	}
 
 	// Shuffle the blocks
-	for i := range blocks {
-		j := rand.Intn(i + 1)
-		blocks[i], blocks[j] = blocks[j], blocks[i]
-	}
+	rand.Shuffle(blocks)
 
 	events.Default.Log(events.ItemStarted, map[string]string{
 		"folder": f.folderID,