starmath, export, preview generation

[Yury]

Hello guys,

Could somebody have a look at the code generating formulas preview in
starmath export?

I have a feeling that bug 88697 in its part relating to the 'too high'
placement of exported formula preview in .DOC (and that's the last part of
88697 yet unresolved) is somehow connected with the initial report on bug
88139 -- formulas had their frames' lower edges shifted up then (lower edge
put on paragraph baseline).