Sougata Bhattacharya created FOP-2355:

             Summary: Issues with stacking of diacritics while trying to render 
PDFs in Thai language
                 Key: FOP-2355
             Project: Fop
          Issue Type: Bug
          Components: fonts, pdf
    Affects Versions: 1.1, trunk
         Environment: Win 7, JDK1.6
            Reporter: Sougata Bhattacharya

Let us take 3 examples, where the first two are rendering ok in the PDF, 
whereas the 3rd is not.

1. ยี = ย + ี (consonant + vowel)

2. ยี่ = ย + ี + ่ (consonant + vowel + diacritic)

3. ย่ = ย + ่ (consonant + diacritic)

The third complex alphabet is showing ok when you see it in 
notepad/MSWord/webpage, etc. but in the PDF, it renders with a vertical space 
in between the diacritic and the consonant, as if a vowel is missing.

Though this does not alter the meaning of the script, it looks unprofessional. 

Similar details on what exactly I am facing can be found in the 2nd example of 
the link:

Fonts used: PSL096pro.ttf, PSL095pro.ttf, PSL094pro.ttf, PSL053pro.ttf, 
PSL052pro.ttf, PSL051pro.ttf, PSL050pro.ttf, etc..

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