Enhance usability in Wordpress Import - preselecting matching authors

[tott]

To increase usability in wordpress imports, especially for imports with many users or imports that are rerun a preselection of authors would increase usability.

patch still works at 11175.

no import file to test it with, though...

current version of patch

import file to create users

import file with various posts assigned to users

Attached a version of the patch against the current trunk.

To test on a fresh trunk install
1) apply patch http://core.trac.wordpress.org/attachment/ticket/8455/import-usability-preselect.diff
2) import http://core.trac.wordpress.org/attachment/ticket/8455/create_users.xml and make sure you let WordPress create the missing users
3) import http://core.trac.wordpress.org/attachment/ticket/8455/user-assignment-test-data.xml and see if the user dropdowns are prefilled correctly.

Replying to tott:

Attached a version of the patch against the current trunk.

To test on a fresh trunk install
1) apply patch http://core.trac.wordpress.org/attachment/ticket/8455/import-usability-preselect.diff

This patches OK against r13305

2) import http://core.trac.wordpress.org/attachment/ticket/8455/create_users.xml and make sure you let WordPress create the missing users

When I do this, the users aren't created and the posts are all assigned to 'admin'. Verified I left the user dropdowns in the default state (- Select -). Did it twice for good measure and still don't get the users created.

3) import http://core.trac.wordpress.org/attachment/ticket/8455/user-assignment-test-data.xml and see if the user dropdowns are prefilled correctly.

Related: #8984

Related: #16148