Posts List Table: $mode is null in display_rows() for Quick Edit

[ocean90]

Set the view mode to excerpt and change a post via Quick Edit.
Expected: You get the excerpt view
Current: You get the list view because the global $mode in WP_Posts_List_Table->display_rows() is null.

$mode gets only defined in WP_Posts_List_Table->prepare_items() which isn't used by wp_ajax_inline_save().

[ocean90]

Looks like this line got removed: https://core.trac.wordpress.org/browser/tags/3.9/src/wp-admin/includes/ajax-actions.php?marks=1348#L1346

Edit: In [28292].

[ocean90]

In 35518:

List Tables: Define the global $mode variable for Quick Edit savings.

Also remove two unused global imports for $mode.

Fixes #34577.

[ocean90]

In 35531:

After [35518] define $_POST['post_view'] in test_dont_process_terms_if_taxonomy_does_not_allow_show_on_quick_edit().

See #34577.