Add Wrap Support on Rich Text Box

Merges #4196

Source/Engine/UI/GUI/Common/RichTextBoxBase.cs

@@ -100,15 +100,19 @@ namespace FlaxEngine.GUI
             }
 
             // Handle case when index is outside all text ranges
-            if (index >= 0 && blockCount > 0 && index <= textBlocksSpan[0].Range.StartIndex)
+            if (index >= 0 && blockCount > 0)
             {
-                result = textBlocksSpan[0];
-                return true;
-            }
-            if (index >= 0 && blockCount > 0 && index >= textBlocksSpan[blockCount - 1].Range.StartIndex)
-            {
-                result = textBlocksSpan[blockCount - 1];
-                return true;
+                if (index <= textBlocksSpan[0].Range.StartIndex)
+                {
+                    result = textBlocksSpan[0];
+                    return true;
+                }
+
+                if (index >= textBlocksSpan[blockCount - 1].Range.StartIndex)
+                {
+                    result = textBlocksSpan[blockCount - 1];
+                    return true;
+                }
             }
 
             // If no text block is found