[poppler] RFC: whole-page search in the qt4 frontend

[Adam Reichold]

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Hello,

If I remember correctly, some time ago someone proposed caching the
TextOuputDev/TextPage used in Poppler::Page::search to improve
performance. Instead, I would propose to add another search method to
Poppler::Page which searches the whole page at once and returns a list
of all occurrences.

Applications using the qt4 frontend and this method could then decide
whether to cache this information or not. The implementation of the
current search method would not change.

The appended patch does this. But the two search methods share some
duplicate code. I am not sure what the best way to avoid this is.

Testing this with some sample files shows large improvements (above
100% as measured by runtime) for searching the whole document and
especially for short phrases that occur often.

Thanks for any comments and advice. Best regards, Adam.
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