Edit math after preview

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Edit math after preview

langemann
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Is it possible to edit a math command after a preview has been created? (not LaTeX instant-preview but the ordinary preview)
 Say I want to change \int to \iint after the integral sign is previewed by just inserting the additional i and, not having to erase the integral sign before inserting a new double-integral sign. There *should* be a possibility for that by, say, pressing F2 or something similar.
 I use LyX 2.0.1 on windows
 
thanks for any suggestions