fix(api): don't update 'title' when renaming non-curbuf #39743

Problem:  'title' is updated when changing the name of a non-current
          buffer with nvim_buf_set_name().
Solution: Set RedrawingDisabled when renaming the buffer.

test/functional/ui/title_spec.lua

@@ -232,5 +232,13 @@ describe('title', function()
         eq(expected, screen.title)
       end)
     end)
+
+    it('changing name of non-current buffer', function()
+      api.nvim_buf_set_name(buf2, 'foo')
+      command('redraw!')
+      screen:expect(function()
+        eq(expected, screen.title)
+      end)
+    end)
   end)
 end)