use add_highlight instead of vim.hl.range

Signed-off-by: Tomas Slusny <[email protected]>

Author: deathbeam

lua/CopilotChat/ui/chat.lua

@@ -614,7 +614,7 @@ function Chat:render()
     if self.tool_calls then
       for _, tool_call in ipairs(self.tool_calls) do
         if line:match(string.format('#%s:%s', tool_call.name, vim.pesc(tool_call.id))) then
-          vim.hl.range(self.bufnr, self.header_ns, 'CopilotChatAnnotationHeader', { l - 1, 0 }, { l - 1, #line })
+          vim.api.nvim_buf_add_highlight(self.bufnr, self.header_ns, 'CopilotChatAnnotationHeader', l - 1, 0, #line)
 
           if not utils.empty(tool_call.arguments) then
             vim.api.nvim_buf_set_extmark(self.bufnr, self.header_ns, l - 1, 0, {