Add and utilize :nth-child() selectors rather than the .alt(ernate) classes

[helen]

Since the new-in-3.8 admin styling is more liberal in allowing IE7 and IE8 to gracefully degrade, we really are overdue to make the jump. This should fix issues with and future-proof list tables that are altered via AJAX, such as comments (#25060). Going to leave the classes in CSS for back-compat.

[helen]

Working on a patch - takes a while to go through all the list tables.

[helen]

Getting back on this. It should fix #25060 and #30981 at the same time.

[helen]

In 31181:

List tables: Use CSS :nth-child() selectors for zebra striping.

Note that this does not fix issues related to comment quick edit. Internal linking also continues to use the .alternate class for now. IE8 and below gracefully degrade by not having zebra striping.

There is some hoop jumping with adding an extra table row to maintain zebra striping during quick edit. Documenting that here for future reference; it is also in the inline documentation.

fixes #30981 and #26060. see #25060.

[helen]

I am optimistic that the above commit fixes this particular ticket, but do please re-open if any issues are noticed (besides what is already documented in #25060).

[Chouby]

@helen
Since you invited to re-open, I will.

in inline-edit-post.js around line 136, you changed
$(t.what+id).hide().after(editRow);
to
$(t.what+id).hide().before(editRow).before('<tr class="hidden"></tr>');

Is there a particular reason to change from "after" to "before"?

In a plugin, I rely on the fact that the quick edit is inserted after. Of course I could adapt my plugin. But maybe I am not the only one. Would the following be ok for you?
$(t.what+id).hide().after('<tr class="hidden"></tr>').after(editRow);

[helen]

I don't recall why I went with .before(). .after() seems to work just as well, although it doesn't actually need the order switched.

[helen]

In 31820:

List tables: Go back to inserting quick edit rows after, as some plugins rely on that assumption. Results are the same.

fixes #26060.

[Chouby]

Thank you. The problem is solved now :)