Automatic diffs for PRs

Hi folks,

As some of you may have noticed from the burst of commits, pull
requests, and merges, I’ve been working on generating automatic diffs
using DeltaXML (who very generously provide an XML Compare license for
this purpose).

I believe it is now working, as you can see in this example:

  https://qt4cg.org/pr/194/xpath-functions-40/autodiff.html

It doesn’t apply to any branches or pull requests that already exist, so
we won’t see it ‘in action’ until the next and following PRs.

I added a bit of explanation about the process:

  https://qt4cg.org/deltaxml.html

This is not intended as a replacement for change markup provided by the
editors (so, no, editors, you can’t stop doing that!), but as an adjunct
to aid in review.

I have been wanting to implement the “go to next diff” feature for years
and I hope it turns out to be useful.

(If you have your own DeltaXML license and wish to steal that feature,
it’s in https://qt4cg.org/js/scroll.js; note that I’ve replaced the JS
for all of the buttons, not just the new ones. Also note that there’s
some special casing in there to skip change markup in the ToC. I found
that if there were multiple scrolling regions, window.scrollTo() didn’t
work consistently, so I avoided any targets in the ToC scrolling view.
It’s probably possible to do better. Also note that I avoided
Element.scrollIntoView(), which does work for all scrolling regions,
because that puts the scrolled item at the very top of the page where
it’s, annoyingly, behind the buttons!)

                                        Be seeing you,
                                          norm

--
Norm Tovey-Walsh
Saxonica