[BUG] Can't use git branch name if branch contains '#' character

[neyhden]

When the option git_use_branch_name is enabled, trying to save the session will result in an error "No alternate file name to substitute for '#'.

Steps to reproduce the behavior:

1. Set git_use_branch_name to true.
2. Switch to a git branch with character '#' in the name.
3. Try to save session.

Expected behavior
The session should save correctly and the '#' character should be escaped in the title as the rest of the special characters.

Checkhealth

auto-session: ✅

Setup ~

• ✅ OK setup() called

Lazy.nvim settings ~

• ✅ OK Lazy.nvim support is enabled
• ✅ OK auto-session is not lazy loaded

Config ~

• ✅ OK No config issues detected

Current Config ~

• {
  args_allow_files_auto_save = false,
  args_allow_single_directory = true,
  auto_create = true,
  auto_delete_empty_sessions = true,
  auto_restore = true,
  auto_restore_last_session = false,
  auto_save = true,
  bypass_save_filetypes = { "neo-tree", "alpha", "dashboard", "snacks_dashboard" },
  close_filetypes_on_save = { "checkhealth", "neo-tree" },
  close_unsupported_windows = true,
  continue_restore_on_error = false,
  cwd_change_handling = false,
  enabled = true,
  git_auto_restore_on_branch_change = false,
  git_use_branch_name = true,
  lazy_support = true,
  legacy_cmds = true,
  log_level = "error",
  lsp_stop_on_restore = false,
  post_restore_cmds = { "let buf=bufnr('%') | exec 'bufdo #' | exec 'b' buf", "Neotree show" },
  root_dir = "/home/eherabr/.local/share/nvim/sessions/",
  session_lens = {
  load_on_setup = true,
  mappings = {
  alternate_session = { "i", "" },
  copy_session = { "i", "" },
  delete_session = { "i", "" }
  },
  previewer = "summary",
  session_control = {
  control_dir = "/home/eherabr/.local/share/nvim/auto_session/",
  control_filename = "session_control.json"
  }
  },
  show_auto_restore_notif = false,
  single_session_mode = false
  }

General Info ~

• Session directory: /home/eherabr/.local/share/nvim/sessions/
• Current session:
• Current session file:
• Selected picker: telescope

Baseline (please complete the following information):

• Result of set sessionoptions?: blank,buffers,curdir,folds,help,tabpages,winsize,winpos,terminal,localoptions
• OS. e.g uname -a: Fedora linux 43, Linux 6.19.9-200.fc43.x86-64
• Neovim version nvim --version v0.11.6
• URL to your current config (if public): https://github.com/neyhden/config