[Bug]: a unpinned buffer was pinned after session restore

[celeste3z]

Is there an existing issue for this?

• [x] I have searched the existing issues

What happened?

Reproduce:

1. pin a buffer A, and I execute :lua print(vim.g["BufferlinePinnedBuffers]), the output is the filepath of buffer A
2. unpin the buffer A, and I re-execute the print cmd above, the output is an empty string
3. mksession and exit neovim
4. open neovim and restore the session, the buffer A is pinned, and I also execute the print cmd above, the output is the filepath of buffer A

I try to solve this problem, it seems like caused by the neovim's session mechanism, we have to do unlet g:BufferlinePinnedBuffers before mksession if #vim.g["BufferlinePinnedBuffers"] == 0

I write a autocmd just like this, the problem seems to be solved:

vim.api.nvim_create_autocmd("User", {                                                          
  group = vim.api.nvim_create_augroup("CelesteFixBufferlineForPinnedBuffer", { clear = true }),
  pattern = "UserDefinedBeforeSessionSave",                                                        
  callback = function()                                                                        
    if vim.fn.exists("g:BufferlinePinnedBuffers") then                                         
      if #vim.g["BufferlinePinnedBuffers"] == 0 then                                           
        vim.cmd("unlet g:BufferlinePinnedBuffers")                                             
      end                                                                                      
    end                                                                                        
  end,                                                                                         
})                                                                                             

What did you expect to happen?

1. pin a buffer A, and I execute :lua print(vim.g["BufferlinePinnedBuffers]), the output is the filepath of buffer A
2. unpin the buffer A, and I re-execute the print cmd above, the output is an empty string
3. mksession and exit neovim
4. open neovim and restore the session, the buffer A wasn't pinned

Config

opts = {
      options = {
        mode = "buffers",
        numbers = function(opts)
          return string.format("%s.%s", opts.id, opts.raise(opts.ordinal))
        end,
        buffer_close_icon = "󰅖",
        modified_icon = "●",
        close_icon = "",
        left_trunc_marker = " ",
        right_trunc_marker = " ",

        offsets = {
          {
            filetype = "NvimTree",
            text = "File Explorer",
            text_align = "center",
            highlight = "Directory",
            separator = true,
          },
        },

        color_icons = true,
        get_element_icon = function(element)
          return require("nvim-web-devicons").get_icon_by_filetype(element.filetype, { default = false })
        end,
        show_buffer_icons = true,
        show_buffer_close_icons = true,
        show_close_icon = true,
        show_tab_indicators = true,

        max_name_length = 18,
        max_prefix_length = 15,
        truncate_names = true,
        diagnostics = "nvim_lsp",
        diagnostics_update_on_event = true,

        pick = {
          alphabet = "abcdefghijklmopqrstuvwxyzABCDEFGHIJKLMOPQRSTUVWXYZ1234567890",
        },
      }, -- options
    },

Additional Information

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