Add zoom in/out shortcuts for images

Valentyn Bondarenkorequested to merge
hunterx/koko:add-zoom-in-n-out-shortcuts into master

Separate zooming images and thumbnails.

To test zoom in-n-out:

  • thumbnails;
  • images;

Should work fine for both.

Related MR: #82.

Edited by Valentyn Bondarenko

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