--auto-zoom is not updated when window size changed, and not applied for first image when --scale-down is enabled

[infmagic2047]

I'm not sure whether this is intended, but it looks like a bug to me.

The following patch fixes it for me, but also introduces some other problems:

diff -uNar feh-2.16/src/winwidget.c feh-2.16-new/src/winwidget.c
--- feh-2.16/src/winwidget.c    2016-06-09 15:02:41.000000000 +0800
+++ feh-2.16-new/src/winwidget.c    2016-06-12 22:16:50.703220494 +0800
@@ -424,7 +424,6 @@
        feh_draw_checks(winwid);

    if (!winwid->full_screen && opt.zoom_mode
-               && (winwid->zoom == 1.0) && ! (opt.geom_flags & (WidthValue | HeightValue))
                && (winwid->w > winwid->im_w) && (winwid->h > winwid->im_h))
        feh_calc_needed_zoom(&(winwid->zoom), winwid->im_w, winwid->im_h, winwid->w, winwid->h);

I don't know the correct way to fix it.

[Osndok]

I notice that specifying an initial "--geometry" works around this issue.... mostly... to re-zoom an image you would have to go forward-then-back to redraw the image.