Before 2.5 there were two types of the texts in administrative data: TEXTAREA (multi-line) and TEXT (single line).
These types remains in 2.12, but since 2.5 the textarea displayed as text.
For example: (real code taken from my inventory). FIEILDS_41 declared as TEXTAREA.
but I see it as single line text
<input type="text" name="fields_41" id="fields_41" value="" class="form-control">
When I changed the HTML (using Chrome built-in devtools) to:
<textarea name="fields_41" id="fields_41" rows="5" cols="40"></textarea>
I saw what I want: multiline text area. What and where should be corrected in php's to show the textarea as TEXT AREA, not as single line text?