Optimize proxy

Optimize delayed sorting performance

Add expansion panel proxies page

Support to adjust the proxy card size

Support to adjust proxies columns number

core/platform/limit.go

@@ -0,0 +1,42 @@
+//go:build android
+
+package platform
+
+import "syscall"
+
+var nullFd int
+var maxFdCount int
+
+func init() {
+	fd, err := syscall.Open("/dev/null", syscall.O_WRONLY, 0644)
+	if err != nil {
+		panic(err.Error())
+	}
+
+	nullFd = fd
+
+	var limit syscall.Rlimit
+
+	if err := syscall.Getrlimit(syscall.RLIMIT_NOFILE, &limit); err != nil {
+		maxFdCount = 1024
+	} else {
+		maxFdCount = int(limit.Cur)
+	}
+
+	maxFdCount = maxFdCount / 4 * 3
+}
+
+func ShouldBlockConnection() bool {
+	fd, err := syscall.Dup(nullFd)
+	if err != nil {
+		return true
+	}
+
+	_ = syscall.Close(fd)
+
+	if fd > maxFdCount {
+		return true
+	}
+
+	return false
+}