fix: cursor position outside buffer error

[kair8m]

Bugfix: Cursor Position Error in lsp_signature Plugin during Parameter Input

Description

Under Neovim 0.9.4, the lsp_signature plugin encountered a critical error when typing parameters inside a function, resulting in the following error:

Error executing vim.schedule lua callback: ...vim/lazy/lsp_signature.nvim/lua/lsp_signature/helper.lua:677: Cursor position outside buffer
stack traceback:
    [C]: in function 'nvim_win_set_cursor'
    ...vim/lazy/lsp_signature.nvim/lua/lsp_signature/helper.lua:677: in function 'highlight_parameter'
    .../nvim/lazy/lsp_signature.nvim/lua/lsp_signature/init.lua:618: in function 'handler'
    ...bob/v0.9.4/nvim-macos/share/nvim/runtime/lua/vim/lsp.lua:1393: in function ''
    vim/_editor.lua: in function <vim/_editor.lua:0>

Changes Made

• Addressed the cursor position error during parameter input inside a function in the lsp_signature plugin.
• Wrapped the problematic function call in helper.lua within a protected call to ignore errors, preventing the plugin from throwing an exception for cursor position outside the buffer.

[kair8m]

I had to add changes that are not relevant to this PR (removed unused variable) because of CI

[ray-x]

why would line == 1(noice +nvim 0.9.x in your case) but cursor failed to jump to line 2. It's a bit strange. I am ok with the changes and thank you for your PR. Just need to figure out why it broke in your side. Could you elaberate a bit more on how to reproduce the issue.