First commit for private source control. Older commits available on Github.

Assets/Plugins/NaughtyAttributes/Scripts/Editor/PropertyDrawers/ResizableTextAreaPropertyDrawer.cs

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+using UnityEngine;
+using UnityEditor;
+using System.Text.RegularExpressions;
+using System;
+
+namespace NaughtyAttributes.Editor
+{
+    [CustomPropertyDrawer(typeof(ResizableTextAreaAttribute))]
+    public class ResizableTextAreaPropertyDrawer : PropertyDrawerBase
+    {
+        protected override float GetPropertyHeight_Internal(SerializedProperty property, GUIContent label)
+        {
+            if (property.propertyType == SerializedPropertyType.String)
+            {
+                float labelHeight = EditorGUIUtility.singleLineHeight;
+                float textAreaHeight = GetTextAreaHeight(property.stringValue);
+                return labelHeight + textAreaHeight;
+            }
+            else
+            {
+                return GetPropertyHeight(property) + GetHelpBoxHeight();
+            }
+        }
+
+        protected override void OnGUI_Internal(Rect rect, SerializedProperty property, GUIContent label)
+        {
+            EditorGUI.BeginProperty(rect, label, property);
+
+            if (property.propertyType == SerializedPropertyType.String)
+            {
+                Rect labelRect = new Rect()
+                {
+                    x = rect.x,
+                    y = rect.y,
+                    width = rect.width,
+                    height = EditorGUIUtility.singleLineHeight
+                };
+
+                EditorGUI.LabelField(labelRect, label.text);
+
+                EditorGUI.BeginChangeCheck();
+
+                Rect textAreaRect = new Rect()
+                {
+                    x = labelRect.x,
+                    y = labelRect.y + EditorGUIUtility.singleLineHeight,
+                    width = labelRect.width,
+                    height = GetTextAreaHeight(property.stringValue)
+                };
+
+                string textAreaValue = EditorGUI.TextArea(textAreaRect, property.stringValue);
+
+                if (EditorGUI.EndChangeCheck())
+                {
+                    property.stringValue = textAreaValue;
+                }
+            }
+            else
+            {
+                string message = typeof(ResizableTextAreaAttribute).Name + " can only be used on string fields";
+                DrawDefaultPropertyAndHelpBox(rect, property, message, MessageType.Warning);
+            }
+
+            EditorGUI.EndProperty();
+        }
+
+        private int GetNumberOfLines(string text)
+        {
+            string content = Regex.Replace(text, @"\r\n|\n\r|\r|\n", Environment.NewLine);
+            string[] lines = content.Split(new string[] { Environment.NewLine }, StringSplitOptions.None);
+            return lines.Length;
+        }
+
+        private float GetTextAreaHeight(string text)
+        {
+            float height = (EditorGUIUtility.singleLineHeight - 3.0f) * GetNumberOfLines(text) + 3.0f;
+            return height;
+        }
+    }
+}