This could be useful for a pdf viewer to zoom in enough so that the margins
are out of view but the text is as large as possible while still being in view.
I notice that the glib interface has poppler_page_find_text return a list of rectangles
where a string occurs. It throws an assertion failure if you give it NULL for a string. It
could be altered to accept NULL and return a single rectangle that includes all the
text by searching for "".
My main interest is not really text neccessarily, but to add an automatic crop the
margin feature to a pdf viewer.
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