fix: calculate max width for docs window

Author: eero-lehtinen

lua/blink/cmp/windows/documentation.lua

@@ -72,13 +72,27 @@ function docs.show_item(item)
       vim.cmd('syntax clear')
       vim.api.nvim_buf_set_lines(docs.win:get_buf(), 0, -1, false, {})
     end)
+
+    -- calculate longest line clamped to config.max_width
+    local max_width = 0
+    for _, l in ipairs(doc_lines) do
+      local len = #l
+      if len > max_width then
+        if len >= config.max_width then
+          max_width = config.max_width
+          break
+        end
+        max_width = len
+      end
+    end
+
     -- use the built-in markdown styling
     -- NOTE: according to https://github.com/Saghen/blink.cmp/pull/33#issuecomment-2400195950
     -- it's possible for this to fail so we call it safely
     local stylize_success = pcall(
       function()
         vim.lsp.util.stylize_markdown(docs.win:get_buf(), doc_lines, {
-          max_width = config.max_width,
+          max_width = max_width,
           max_height = config.max_height,
         })
       end