pods_field_dfv_data filter isn't being applied to a newly created value (only upon a refresh)

[EthanPhoenix]

Issue Overview

It seems that the "pods_field_dfv_data" filter (similar to "pods_field_pick_data") only manipulate pre-existing values and not newly created ones.

Expected Behavior

Unsure if there is another filter of "post value" creation but one would expect that any display manipulations happening to pre-existing fields will also happen to newly created ones.

Current Behavior

As it currently stands, the newly created field entry will pick the value of the field that is set in the "Title Field" under the "Advanced Options" tab of that related pod.

Steps to Reproduce (for bugs)

To make it convenient, below is the code as a test plugin.
`<?php
/*
Plugin Name: Newly Added Field Display Test
Plugin URI:
Description:
Version: 0.0.0
Author: Ethan Phoenix
Author URI: http://www.ethanphoenix.tk
*/

// don't call the file directly
if ( !defined( 'ABSPATH' ) ) exit;

add_action( 'plugins_loaded', 'ethansAddon_extend_safe_activate');
function ethansAddon_extend_safe_activate() {
if ( defined( 'PODS_VERSION' ) ) {

// MANIPULATING FIELD DISPLAY 
	add_filter('pods_field_dfv_data', 'combobox_display_data', 1, 6);
	function combobox_display_data($data, $args, $attributes){
		switch ($data['fieldConfig']['name']) {
			case 'country':
				foreach ($data['fieldItemData'] as $i=>$val) {
					$dataid = $data['fieldItemData'][$i]['id'];
					$countryName = pods_field_display('country', $dataid, 'name', true);
					$data['fieldItemData'][$i]['name'] = "{$countryName} This text is being added because of a filter but only to an already existing values.";
				}
			break;
		};
		return $data;
	}
}

}`

below image shows a selected value which already existed in the table and thus the text "This text is being added because of a filter but only to an already existing values." is being added to the value.

this image shows a newly added value "Canada" but as you can see it didn't pass the aforementioned filter and thus only shows the "default" value (a set in the "Title Field" in the related pod's setup screen):

and here you can see that it does apply but AFTER the entry has been added and we refreshed the page:

Possible Solution

Either add another "post add" filter or inject the filter again after adding a new value.

WordPress Environment

``` Debug Information

WordPress Version: 4.9.8

PHP Version: 7.0.31

MySQL Version: 5.7.23

Server Software: Apache

Your User Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:52.0) Gecko/20100101 Firefox/52.0

Session Save Path: C:/Bitnami/WORDPR~1.8-0/php/tmp

Session Save Path Exists: Yes

Session Save Path Writeable: Yes

Session Max Lifetime: 1440

Opcode Cache:

Apc: No
Memcached: No
OPcache: Yes
Redis: No

Object Cache:

APC: No
APCu: No
Memcache: No
Memcached: No
Redis: No

WPDB Prefix: wp_

WP Multisite Mode: No

WP Memory Limit: 40M

Pods Network-Wide Activated: No

Pods Install Location: C:\Bitnami\wordpress-4.9.8-0\apps\wordpress\htdocs\wp-content\plugins\pods/

Pods Tableless Mode Activated: No

Pods Light Mode Activated: No

Currently Active Theme: Twenty Seventeen

Currently Active Plugins:

Newly Added Field Display Test: 0.0.0
Pods - Custom Content Types and Fields: 2.7.9

</details>

## Pods Package Export (helpful!)

{"meta":{"version":"2.7.9","build":1534559383},"pods":{"5":{"id":5,"name":"country","label":"Countries","description":"","type":"pod","storage":"table","object":"","alias":"","fields":{"name":{"id":6,"name":"name","label":"Name","description":"","help":"","class":"","type":"text","weight":0,"pick_object":"","pick_val":"","sister_id":"","required":"1","unique":"0","text_repeatable":"0","text_allowed_html_tags":"strong em a ul ol li b i","text_max_length":"255","text_placeholder":""},"flag":{"id":7,"name":"flag","label":"Flag","description":"","help":"","class":"","type":"file","weight":1,"pick_object":"custom-simple","pick_val":"","sister_id":"","required":"0","unique":"0","file_format_type":"single","file_uploader":"plupload","file_attachment_tab":"upload","file_edit_title":"1","file_show_edit_link":"1","file_linked":"1","file_limit":"0","file_restrict_filesize":"10MB","file_type":"images","file_field_template":"rows","file_add_button":"Add File","file_modal_title":"Attach a file","file_modal_add_button":"Add File","file_wp_gallery_output":"0","file_wp_gallery_link":"post","file_wp_gallery_columns":"1","file_wp_gallery_random_sort":"0","file_wp_gallery_size":"thumbnail","pick_post_status":["publish"],"admin_only":"0","restrict_role":"0","restrict_capability":"0","hidden":"0","read_only":"0","roles_allowed":["administrator"],"file_allowed_extensions":""}},"show_in_menu":"1","label_singular":"Country","pod_index":"name","hierarchical":"0","ui_style":"post_type","ui_actions_enabled":["add","edit","duplicate","delete"],"ui_reorder_field":"menu_order","ui_fields_manage":{"0":"name","2":"modified"}},"8":{"id":8,"name":"event","label":"Events","description":"","type":"pod","storage":"table","object":"","alias":"","fields":{"name":{"id":9,"name":"name","label":"Name","description":"","help":"","class":"","type":"text","weight":0,"pick_object":"","pick_val":"","sister_id":"","required":"1","unique":"0","text_repeatable":"0","text_allowed_html_tags":"strong em a ul ol li b i","text_max_length":"255","text_placeholder":""},"country":{"id":10,"name":"country","label":"Country","description":"","help":"","class":"","type":"pick","weight":1,"pick_object":"pod","pick_val":"country","sister_id":"","required":"1","unique":"0","pick_format_type":"multi","pick_format_single":"list","pick_format_multi":"list","pick_allow_add_new":"1","pick_taggable":"0","pick_show_icon":"0","pick_show_edit_link":"1","pick_show_view_link":"0","pick_limit":"0","pick_user_role":[],"pick_post_status":["publish"],"admin_only":"0","restrict_role":"0","restrict_capability":"0","hidden":"0","read_only":"0","roles_allowed":["administrator"],"pick_select_text":"","pick_table_id":"","pick_table_index":"","pick_display":"","pick_where":"","pick_orderby":"","pick_groupby":""}},"show_in_menu":"1","label_singular":"Event","pod_index":"name","hierarchical":"0","ui_style":"post_type","ui_actions_enabled":["add","edit","duplicate","delete"],"ui_reorder_field":"menu_order","ui_fields_manage":["name"]}}}

## Workaround or Alternate Solution Until Bug is Addressed
<!-- We will complete this section, or if you've already found a workaround, -->
<!-- you can add it here -->

## Related Issues and/or PRs
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[pglewis]

The pods_field_dfv_data filter is only called on page load in order to initialize the starting values for the field, so it was not designed for this.

When you add a record using the "Add New" button, new values are created on the select box dynamically in the browser. I think we can come up with a clean way to do what you're trying to do but it will likely be a job for Javascript and not PHP.

I'm going to close this one in favor of your other ticket, #5091. A proper solution should handle both cases.

[pglewis]

On second thought: re-opening this because there still needs to be a way to hit a filter on add new on the server side, in order to look up custom data. A new filter is called for.