Bug: form_textarea helper row and col defaults not overwriting when defined as $extra

[durbintl]

Describe the bug
The default text area row="10" and col="40" is not overwritten with the value provided, either as an array or string, in the $extra parameter.

CodeIgniter 4 version
CI 4.0.4 (master)

Affected module(s)
Form Helper

Expected behavior, and steps to reproduce if appropriate
Currently form_textarea('demo', '', ['rows'=>'4', 'cols'=>'10']) and form_textarea('demo', '', 'rows="4" cols="10"') would both output <textarea name="mailingaddress" cols="40" rows="10" rows="4" cols="10"></textarea>.

Context

• OS: macOS Catalina 10.15.5
• Web server Apache 2.2.34
• PHP version 7.4.2

[nyufeng]

see: https://codeigniter4.github.io/userguide/helpers/form_helper.html#form_textarea

form_textarea( ['rows'=>'4', 'cols'=>'10']);

form_textarea([
    "id" => "form-text",
    "rows" => 12,
    "cols" => 15,
    "class" => ".form-area"
],"Hello world", 'style="color:read;font-size:12px;"');

//out

<textarea cols="15" rows="12" id="form-text" class=".form-area"  style="color:read;font-size:12px;">Hello world</textarea>

[durbintl]

@Instrye What you are suggesting does function as expected, however this bug targets the third parameter $extra in form_textarea([$data = ''[, $value = ''[, $extra = '']]]). Of course we could remove the second and third parameters, but since the code is already in use, that would not be wise less an update should break a site. :)

[durbintl]

PR is in testing now.