fix(defaults): silent gx if no textDocument/documentLink support #37969

Problem: If buffer has attached LSP servers and none of them supports
  `textDocument/documentLink` method, typing `gx` results in a warning
  about that.

Solution: Explicitly check that at least one server supports the target
  method before making the LSP request.

runtime/lua/vim/ui.lua

@@ -204,20 +204,19 @@ function M._get_open_cmd()
   end
 end
 
---- Returns all URLs at cursor, if any.
---- @return string[]
-function M._get_urls()
-  local urls = {} ---@type string[]
-
-  local bufnr = vim.api.nvim_get_current_buf()
-  local cursor = vim.api.nvim_win_get_cursor(0)
-  local row = cursor[1] - 1
-  local col = cursor[2]
-
-  -- Find LSP document links under the cursor.
+--- @param bufnr integer
+local get_lsp_urls = function(bufnr)
+  local has_lsp_support = false
+  for _, client in pairs(vim.lsp.get_clients({ bufnr = bufnr })) do
+    has_lsp_support = has_lsp_support or client:supports_method('textDocument/documentLink', bufnr)
+  end
+  if not has_lsp_support then
+    return {}
+  end
   local params = { textDocument = vim.lsp.util.make_text_document_params(bufnr) }
   local results = vim.lsp.buf_request_sync(bufnr, 'textDocument/documentLink', params)
 
+  local urls = {}
   for client_id, result in pairs(results or {}) do
     if result.error then
       vim.lsp.log.error(result.error)
@@ -239,6 +238,20 @@ function M._get_urls()
       end
     end
   end
+  return urls
+end
+
+--- Returns all URLs at cursor, if any.
+--- @return string[]
+function M._get_urls()
+  local urls = {} ---@type string[]
+
+  local bufnr = vim.api.nvim_get_current_buf()
+  local cursor = vim.api.nvim_win_get_cursor(0)
+  local row = cursor[1] - 1
+  local col = cursor[2]
+
+  urls = vim.list_extend(urls, get_lsp_urls(bufnr))
 
   local extmarks = vim.api.nvim_buf_get_extmarks(bufnr, -1, { row, col }, { row, col }, {
     details = true,