Cannot manually enter page number when browsing the Plugins -> Add New screens

[johnbillion]

Steps to reproduce:

1. Go to Plugins -> Add New and switch to the Popular tab.
2. Enter a page number in the text input between the pagination controls, then hit enter.
3. Note that nothing happens.

This behaviour works as expected on other screens where pagination controls are present.

This crippling bug has been present since 3.1.

[jesin]

Patch 29481.diff​ does the following:

• Adds a <form> tag enclosing the list of plugins and top navigation.
• Adds a nonce field to the WP_Plugin_Install_List_Table::display_tablenav() function.
• Checks for HTTP request variable _wp_http_referer and adds the query arg paged to the URL.

[karpstrucking]

this is a duplicate of #18724 but I'm not sure the protocol for closing duplicates - #18724 has been around for awhile, but your patch is more thorough than the latest patch there.

[jesin]

Duplicate of #18724.