Changing zoom causes view to be lost

[Felix von Drigalski]

Currently, changing the zoom setting generally causes the view of the image to change drastically. It would be more intuitive and save on scrolling/searching if it preserved the center pixel of the previous and new view.

The image viewer in both the masks and control points tab seem to behave this way. I tried the 2013 and 2014 release version on OS X. I'm pasting the System tab information below.

Thanks in advance for looking into it :)

Operating System: Mac OS X (Darwin 14.4.0 x86_64)
Architecture: 64 bit
Free memory: 0 kiB

Hugin
Version: 2014.0.0 built by Matthieu DESILE
Path to resources: /Applications/Hugin.app/Contents/Resources/xrc/
Path to data: /Applications/Hugin.app/Contents/Resources/xrc/
Path to public lensfun database: /Applications/Hugin.app/Contents/Resources/lensfun
Path to user lensfun database: /Users/Felix/.local/share/lensfun

Libraries
wxWidgets: 3.0.1.0
libpano13: 2.9.19
Boost: 1.55.0
Exiv2: 0.23.0
Lensfun: 0.2.8.0

[tmodes (tmodes)]

Implemented in changeset 19594673dfe9