Add ability to define multiple dropdown fields

[Aeto-J]

Hello,

-Add multiple dropdown feature ( creation and default value)

Thank you,
Regards Aeto-J

[cedric-anne]

Hi,

1. I simplified the field form to use only one ajax endpoint.
2. I fixed log entry handling (was failing with a MySQL warning SQL: SELECT `glpi_computers`.*, '' AS `transname`, '' AS `transcomment` FROM `glpi_computers` WHERE `glpi_computers`.`id` = '["10","9","25"]'.
3. I fixed display of search option in search results.
4. I extended this behaviour to 'dropdown' fields.
5. I renamed field from 'multiple_dropdown' to 'multiple', as this field may also be used if we want to allow multiple text values in the future.

If it is OK for you, I will merge it.

[tomolimo]

Hello @cedric-anne
This is OK for me,
Thank you
Regards,
Tomolimo

[Aeto-J]

Hello,
there is a warning at the default value of a new dropdown field

I think the error must come from line 96 of the 'field_specific_field.php' file because the '$dropdown_matches' variable is initialized on line 81 and reset to null before a test to display the default value this erases the 'class' key from the table and we need it to create the default value field

I don't know if line 96 is useful for this feature to work

Thank you,
Regards,
Aeto-J