util.doc_is_open preforms case sensitive comparisent on windows

[Callmore]

OS: Windows 11
Lite XL version: 2.1.4

Managed to hack it to fix it locally, though the fix was to force the drive letter to uppercase.
When trying to check if the file was open to show diagnostics on it, the lua language server was returning the letter as lowercase, but the opened file in lite XL has an uppercase drive letter. This was causing the comparisent to fail, for seemingly no reason.
Think this is related to #114 as the diagnostics would appear before I hacked it when toggled, as they where shown whenever I turned them off and back on again.

[Guldoman]

Does replacing

lite-xl-lsp/util.lua

Lines 16 to 29 in ed83454

	function util.doc_is_open(abs_filename)
	-- make path separator consistent
	abs_filename = abs_filename:gsub("\\", "/")
	for _, doc in ipairs(core.docs) do
	---@cast doc core.doc
	if doc.abs_filename then
	local doc_path = doc.abs_filename:gsub("\\", "/")
	if doc_path == abs_filename then
	return true;
	end
	end
	end
	return false
	end

with something like

function util.doc_is_open(abs_filename)
  -- make path separator consistent
  abs_filename = common.normalize_path(abs_filename)
  for _, doc in ipairs(core.docs) do
    ---@cast doc core.doc
    if doc.abs_filename == abs_filename then
      return true;
    end
  end
  return false
end

solve the issue?

[Callmore]

It does solve it.

[Guldoman]

Should be fixed with 21faf00.

You can test it using lpm with lpm run --ephemeral https://github.com/lite-xl/lite-xl-lsp.git:21faf00bdcb59e5b81ae8b1018d262cbf84efc81 lsp.