Alternate highlighting doesn't extend all way down a list of posts

[johnhennmacc]

20 posts at a time are now listed on the Manage Posts page rather than 16 as before and The result is that the alternation of row background colours only extends part way down the table (a darker background makes it more obvious).

One way to fix it is to change line 27 in wp-admin/edit-post-rows from the following:

$class = ( $i_post > 15

'alternate' == $class) ? : 'alternate';

to:

$class = ( $i_post > 19

'alternate' == $class) ? : 'alternate';

This is left over from the continuous editing feature that no longer applies. I'll change to query 15 posts and get rid of the no longer needed add-post AJAX action.

(In [7352]) Display 15 posts. Remove no longer needed add-post AJAX action. Props johnhennmacc. fixes #6264

6264.diff removes some other remnants of the old infinite posts feature.

(In [7359]) Remove remnants of infinite posts features. Props mdawaffe. fixes #6264