GUISettings.tripleClickSelectsLine
var tripleClickSelectsLine: bool;
bool tripleClickSelectsLine;
tripleClickSelectsLine as bool
Description

Should triple-clicking select whole text in text fields.

Bu default is set to true.
	// Disables line selecting with triple click on the text area
	var str : String = "This is a string with \n two lines of text";

function OnGUI() { GUI.skin.settings.tripleClickSelectsLine = false; str = GUILayout.TextArea(str); }
using UnityEngine;
using System.Collections;

public class Example : MonoBehaviour {
    public string str = "This is a string with \n two lines of text";
    void OnGUI() {
        GUI.skin.settings.tripleClickSelectsLine = false;
        str = GUILayout.TextArea(str);
    }
}
import UnityEngine
import System.Collections

public class Example(MonoBehaviour):

	public str as string = 'This is a string with \n two lines of text'

	def OnGUI() as void:
		GUI.skin.settings.tripleClickSelectsLine = false
		str = GUILayout.TextArea(str)