skip setup in diff mode

lua/navigator/lspclient/clients.lua

@@ -613,7 +613,7 @@ local function on_filetype()
   if ft == nil then
     return
   end
-  if uri == 'file://' or uri == 'file:///' then
+  if uri == 'file://' or uri == 'file:///' or vim.wo.diff then
     trace('skip loading for ft ', ft, uri)
     return
   end

lua/navigator/treesitter.lua

@@ -109,7 +109,10 @@ function M.find_definition(range, bufnr)
     if definition then
 
       -- stylua: ignore start
-      trace( 'error: def not found in ', bufnr, definition:range(), definition:type(), definition:parent():type())
+      trace( 'error: def not found in ', bufnr, definition:range(), definition:type())
+      if definition:parent() then
+        trace("def not found", definition:parent():type())
+      end
       -- stylua: ignore end
     end
   end