Zoom not working well in vflip

[simonkolotov]

Another issue: when in vflip, zooming out (with the mouse wheel) doesn't work after a certain (very close) point: the image just jumps out of the screen, and the coordinates go only up (positive Y).

A probably related problem doesn't allow smooth dragging of the image (with the middle button) in vflip.

NB: when toggling vflip (with 'v'), everything falls back to good behaviour...

S.