Submit-safe placeholder pre-selection

Hi,

it seems there was a bug with this addon and GForms non-ajax submit-mode. Because the placeholder-option gets always inserted on top and has “selected” set, previously selected options got ignored (e.g. in case of a form error).

I took the liberty to “fork” the plugin code on github and added a patch – please see https://github.com/25th-floor/gravity-forms-placeholder-support-add-on/commit/735826e8beb979d1467d8ef9bdfff4d6f4c0f4cd

The previous commits on this repository are just code formatting and CRLF related.

https://ww.wp.xz.cn/plugins/gravity-forms-placeholder-support-add-on/