Selecting a substring in \mathbb{xxxxxxx} or boldsymbol{xxxxx}

[Kornel Benko]

Suppose we have
	$\mathbb{ABD}$
now try to select 'B' and use it somewhere. We only get 'B' instead of $\mathbb{B}$
This is a problem while searching in adv. find for $\mathbb{B}$.

One solution would be to use mathbb and boldsymbol like an accent, so that in the lyx
file would be
	$\mathbb{A}\mathbb{B}\mathbb{D}$

I tried to handle it inside lyxfind.cpp, but the search in parts of the parameter only
sees ascii.

The latex-output looks is OK with this change, but lyx preview displays extra spaces (see
the attached).
	

	Kornel
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