** When using hideshow.el, incremental search can temporarily show hidden<BR>
blocks if a match is inside the block. 
<P>
The block is hidden again if the search is continued and the next match
is outside the block.  By customizing the variable
isearch-hide-immediately you can choose to hide all the temporarily
shown blocks only when exiting from incremental search.
<P>
By customizing the variable hs-isearch-open you can choose what kind
of blocks to temporarily show during isearch: comment blocks, code
blocks, all of them or none.
<P>