hwhw/kindlepdfviewer — pull request #463 by chrox (2012-10-19 14:44:44+00:00)
Title: Bugfix: update offset_y when global zoom value is changed

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.