detail for TextWordBlock for Windows

[xtuzy]

• 测量大小 maui.graphics使用canvastextlayout的drawbounds获取文本大小，但看https://microsoft.github.io/Win2D/WinUI2/html/P_Microsoft_Graphics_Canvas_Text_CanvasTextLayout_LayoutBounds.htm ，layoutbounds和android从staticlayout获取的大小更相似
• 空白字符 canvastextlayout测单独的空白字符时，获得的宽为0, 从layoytbounds能获得高度数值，其值和其他字符都一样，搜索到 https://www.google.com/amp/s/www.freecodecamp.org/chinese/news/html-space-how-to-add-spaces/amp/ ，可能考虑其它字符替代，需要看ios和android上测量得多少，或者使用包含空格的文本去减去其他字符获得

[xtuzy]

FotSize=14, Font.Default时

• Windows
  • space w = 0, h = 18.6210938
  • n w = 7.92285156, h = 18.6210938
  • m w = 12.0585938, h = 18.6210938
  • "n m" w=23.8164063, h=18.6210938 => calculate space w= 3.83496
• Android
  • space w = 3.272727, h = 16.36364
  • n w=7.6363635 h=16.363636
  • m w = 12, h = 16.36364
  • "n m" w=22.90909 h=16.363636 => calculate space w= 3.2727265
• iOS
  • space w=3.7871094 h=16.707031
  • n w=8.018555 h=16.707031
  • m w=12.03125 h=16.707031
  • "n m" w=23.836914 h=16.707031 => calculate space w= 3.787109