Drop Cap: scale for descenders doesn't work with some swash fonts

[SirPL]

I found that Publisher has problem with certain swash fonts when Scale for descenders is enabled.

APub 1.7.0.293

Steps to reproduce:

1. Detach all styles (for keeping minimal number of styles; this step is not required)
2. Create a new character style (let's call it Drop Cap Style):
   • Font family: Gabriola (one of Windows fonts)
   • Variants: Stylistic Set 06 set to 1 (other set to 0)
3. Create a new paragraph style (let's call it Drop Cap):
   • Drop Caps: Enabled
   • Height in lines: 3
   • Scale for descenders: checked
   • Style: Drop Cap Style
4. Now type a few lines of text starting with lowercase g.

Result:

• Only two lines of the text are indented due to drop cap, despite of setting height in lines to 3.

The same issue can be observed in Yana regular font with Stylistic Set 03 enabled, when J is a drop cap letter.