[bug]Some bugs found in NGUI 2.1.4 and earlier versions

[YD4k]

Hi Aren,

Found some bugs that might need a little fix:

1. NGUIMath.cs, CalculateRelativeWidgetBounds() will generate a wrong out put in 2.1.4, when no NGUI widgets were found in children of UITable.

in line 332:

1. if (widgets.Length == 0) return new Bounds(root.position, Vector3.zero);
2.  

should not use root.position since it's a "Relative" bound, might be a wrong copy&paste when upgrading to 2.1.4, older versions used Vector3.zero and that should be the right value for default.

2. UIFont.cs , WrapText() will miss calculate the width of some texts like "[System]" in the text, and it will be calculated as a color tag and leads to wrong line wrapping.

in line 602:

1. offset +=7;
2. continue;
3.  

we should double check its a valid color tag. I used something like this:

1. if (NGUITools.EncodeColor(NGUITools.ParseColor(text, offset + 1)) == text.Substring(offset + 1, 6).ToUpper())
2. {
3.      offset += 7;
4.      continue;
5. }
6.  

3.NGUITools.cs, ParseSymbol(). Same bug happened here, when parsing color tags, should double check it
line 191:

1. Color c = ParseColor(text, index + 1);
2. c.a = colors[colors.Count - 1].a
3. colors.Add(c);
4.  

I used the same trick to fix that:

1. Color c = ParseColor(text, index + 1);
2.  
3. if (EncodeColor(c) != text.Substring(index + 1, 6).ToUpper())
4.     return 0;
5.  
6. c.a = colors[colors.Count - 1].a
7. colors.Add(c);
8.  

[ArenMook]

Thanks!