Viewer - Lock zoom

[Dreamer]

Sometimes the images are slower than window, it's possible to zoom in, but after switching to another image zoom is not preserved, so it's impossible to view multiple images in "full window".

Lock zoom toolbar button and keyboard shortcut would preserve actual zoom value for other images within the same session.

If the option "Original size" (1:1) is used, option Lock zoom should lock this zoom value too.

It's a standard option in image viewers.

[Forez]

+1