Related: fdo#45355 stale gdi font handles apparently still used

When we do glyph fallback we check to see if the glyph is too large to fit the
space available, and if it is we try and rescale it smaller.

This worked wonderfully under Linux, but under Windows it seems that the
SalLayout impl keeps an old unscaled gdi font handle which would give visually
broken glyphs for me when the base font was smaller than the replacement font.

So, now instead rather than just changing the font for the fallback level, we
throw away the SalLayout using the old font, set the font for the fallback
level, and recreate a new SalLayout using the new font.

Hopefully this is the true reason behind the crashes of fdo#45355 although
that remains unreproducible for me.

Change-Id: I415b6e7a77777d4aa5e62079c52c6c18473c0ebd

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