hwhw/kindlepdfviewer — pull request #468 by chrox (2012-10-19 20:39:12+00:00)
Title: Bugfix: guess and update offset_y after changing globalzoom

When zoom out at the bottom of a page upper part of the page will not displayed because offset_y is less than the new min_offset_y. With this patch offset_y is set to offset_y*zoom/last_zoom making the first line of the page stay roughly still in the new view.