Follow-up to #31242

Step 20 of update-the-rendering says to "update the rendering or user interface of doc and its node navigable to reflect the current state".

I presume that, in Servo, this means issuing a reflow, which is done at https://github.com/servo/servo/pull/31505/files#diff-2c5948584719622eef023c56cdf90e8278971f2f2eda26e7fd0485a24c32be3cR1794

However, there are many calls to reflow made across script. I think it needs a separate PR to track them all down and decide which ones are necessary(but probably not spec conformant), and which ones can be removed, or rather: consolidated into that almost last step that reads "update the rendering or user interface of doc (...)"