fix: make_position_params needs offset encoding in v0.11

vim.lsp.util.make_position_params requires the explicit client
encoding as of nvim v0.11

Fixes: ray-x#346

lua/lsp_signature/helper.lua

@@ -790,6 +790,16 @@ function helper.check_lsp_cap(clients, line_to_cursor)
   return signature_cap, triggered, trigger_position, triggered_chars
 end
 
+helper.make_position_params = function()
+  if vim.fn.has "nvim-0.11" == 0 then
+    return vim.lsp.util.make_position_params()
+  end
+  ---@param client vim.lsp.Client
+  return function(client)
+    return vim.lsp.util.make_position_params(nil, client.offset_encoding)
+  end
+end
+
 helper.highlight_parameter = function(s, l)
   _LSP_SIG_CFG.ns = api.nvim_create_namespace('lsp_signature_hi_parameter')
   local hi = _LSP_SIG_CFG.hi_parameter

lua/lsp_signature/init.lua

@@ -708,7 +708,7 @@ local signature = function(opts)
     end
   end
 
-  local params = vim.lsp.util.make_position_params()
+  local params = helper.make_position_params()
   log('change trigger pos to ', params.position.character, trigger_position)
   local shift = math.max(1, trigger_position - 0)
   params.position.character = shift
@@ -1074,7 +1074,7 @@ M.check_signature_should_close = function()
       status_line = { hint = '', label = '' }
       return
     end
-    local params = vim.lsp.util.make_position_params()
+    local params = helper.make_position_params()
     params.position.character = math.max(trigger_position, 1)
     line = api.nvim_get_current_line()
     line_to_cursor = line:sub(1, pos[2])
@@ -1148,7 +1148,7 @@ M.toggle_float_win = function()
     return _LSP_SIG_CFG.floating_window
   end
 
-  local params = vim.lsp.util.make_position_params()
+  local params = helper.make_position_params()
   local pos = api.nvim_win_get_cursor(0)
   local line = api.nvim_get_current_line()
   local line_to_cursor = line:sub(1, pos[2])