Dirty fix 将删除/更改$pluginInstallSearch.on 仅在提交时触发。更改后的函数如下所示。请记住，不建议这样做。

$pluginInstallSearchOnlyonSubmit = $(".plugin-install-php .search-form.search-plugins");
$pluginInstallSearchOnlyonSubmit.on( \'submit\', _.debounce( function( event, eventtype ) {
var $searchTab = $( \'.plugin-install-search\' ), data, searchLocation;
    data = {
        _ajax_nonce: wp.updates.ajaxNonce,
        s:           $pluginInstallSearchOnlyonSubmit.find(\'.wp-filter-search\').val(),//Set the search input value
        tab:         \'search\',
        type:        $( \'#typeselector\' ).val(),
        pagenow:     pagenow
    };
  .........

var e = $._data( $(\'.wp-filter-search\')[0], \'events\' );
delete( e.keyup );
e.input2 = e.input;
delete( e.input );
$(\'.wp-filter-search\').keypress(function(e) {
    if ( 13 === e.which ) {
        $(this).trigger( \'input2\' );
    }
});

我在这里为这一点准备了一个插件：https://github.com/srikat/Disable-Dynamic-Plugin-Install-Search