Inconsistent line height with Cambodian Unicode 2

[Didi Kanjahn]

> I'm not top-posting

All 3 columns in the Khmer example below have a different height.
The latest version tested was 2.13.23-1.
The font selected in the first example is a Microsoft font, but any Khmer
Unicode font I have tested shows the same behavior. The font 'Khmer UI' that
comes with Windows 7 as default font behaves very differently (non-standard)
from other fonts, it may not show the problem. I can provide fonts of my own.

Some fonts can be downloaded at:
http://sourceforge.net/projects/khmer/files/Fonts%20-%20KhmerOS/KhmerOS%20Fonts%205.0-%20LGPL%20Licence/KhmerOS_.ttf/download

Further below a second example using a Khmer Unicode font, but with Roman script
letters only. Here all columns have the same height.

Didi


\version "2.13.3"

\markup { 
  \column {
    \fill-line {
      \left-column {
        \override #'(font-name . "Khmer Mool") \fontsize #1 {
        "ខ្ញុំ"
        "ខ្ញុំ"
        "ខ្ញុំ"
        "ខ្ញុំ"
        "ខ្ញុំ"
        "ខ្ញុំ"
        "ខ្ញុំ"
        "ខ្ញុំ"
        "ខ្ញុំ"
        "ខ្ញុំ"
        "ខ្ញុំ"
        "ខ្ញុំ"
                }
          }
      \left-column {
        \override #'(font-name . "Khmer Mool") \fontsize #1 {
        "ខ្ញុ"
        "ខ្ញុ"
        "ខ្ញុ"
        "ខ្ញុ"
        "ខ្ញុ"
        "ខ្ញុ"
        "ខ្ញុ"
        "ខ្ញុ"
        "ខ្ញុ"
        "ខ្ញុ"
        "ខ្ញុ"
        "ខ្ញុ"
                }
          }
      \left-column {
        \override #'(font-name . "Khmer Mool") \fontsize #1 {
        "ខ្ញ"
        "ខ្ញ"
        "ខ្ញ"
        "ខ្ញ"
        "ខ្ញ"
        "ខ្ញ"
        "ខ្ញ"
        "ខ្ញ"
        "ខ្ញ"
        "ខ្ញ"
        "ខ្ញ"
        "ខ្ញ"
                }
          }
      \left-column {
        \override #'(font-name . "Khmer Mool") \fontsize #1 {
        "ខ"
        "ខ"
        "ខ"
        "ខ"
        "ខ"
        "ខ"
        "ខ"
        "ខ"
        "ខ"
        "ខ"
        "ខ"
        "ខ"
                }
          }
        }
  }
}


---------

\version "2.13.3"
\markup { 
  \column {
    \fill-line {
      \left-column {
        \override #'(font-name . "Khmer Busra") \fontsize #1 {
        "n"
        "n"
        "n"
        "n"
        "n"
                }
          }
      \left-column {
        \override #'(font-name . "Khmer Busra") \fontsize #1 {
        "gd"
        "gd"
        "gd"
        "gd"
        "gd"
                }
          }
      \left-column {
        \override #'(font-name . "Khmer Busra") \fontsize #1 {
        "Ä"
        "Ä"
        "Ä"
        "Ä"
        "Ä"
                }
          }
        }
  }
}