Font_metric code cleanup breaks fetaText positioning

[Neil Puttock]

Hi Han-Wen,

Your first patch from the set you've pushed breaks the positioning of
fetaText glyphs, since they now all have logical extents in the Y axis
(rather than ink extents).

I've attached picture with the debug code for checking extents
switched on (the circle is supposed to be a string number :)

Cheers,
Neil

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