Gravity Forms 2.8.9

- Added *[gform_custom_merge_tags](https://docs.gravityforms.com/gform_custom_merge_tags/)* JavaScript filter to allow the inclusion of custom merge tags.
- Added `gform_merge_tags_supported_input_types` JavaScript filter to allow the inclusion of specific input types for merge tags.
- Added the `gform_pre_post_render` filter to GFFormDisplay:ost_render_script() to abort the rendering process.
- Fixed a bug that prevents the error icon from displaying in the validation summary in the Gravity Forms 2.5 Theme.
- Fixed the padding of field validation messages in the Gravity Forms 2.5 Theme.
- Fixed a bug that prevented notification CC and BCC fields from correctly handling comma-separated merge tags.
- API: Updated the file upload field value in the draft entry from GFFormsModel::create_lead() to contain a JSON encoded array of file details instead of the incorrect file URL.
- API: Updated the border color of disabled inputs in the Settings API.

- API: Updated the file upload field value in the draft entry from GFFormsModel::create_lead() to contain a JSON encoded array of file details instead of the incorrect file URL.
- Fixed a bug that prevents the error icon from displaying in the validation summary in the Gravity Forms 2.5 Theme.
- Fixed the padding of field validation messages in the Gravity Forms 2.5 Theme.
- Fixed a bug that prevented notification CC and BCC fields from correctly handling comma-separated merge tags.

- Added security enhancements.
- Fixed the `gform_required_legend` filter to that the `$form` parameter is passed correctly.
- Fixed an issue that causes the Entry menu item to appear disabled when on an Entry screen.
- Fixed an issue where importing a form with Next buttons causes an error.
- Fixed an issue which causes empty column headers in entry exports for the address field latitude and longitude inputs added by the Geolocation Add-On.
- Fixed an issue that prevents replacement of the field merge tag when the input ID includes alphanumeric characters like {Address (Latitude):1.geolocation_latitude}.
- Updated the datepicker to fit on small screens.