Shortcuts doesn't work after closing DialogView

Examples to reproduce with new gallery extension:

- open arbitrary directory with images

- arrows still work to navigate in FB

- open an image with gallery extension (DV) by clicking on it

- close the DV

• arrows do not work anymore to navigate in FB

(from redmine: issue id 2291, created on 2016-03-19 by fabian.heidemann, closed on 2016-03-22)

• Changesets:
  • Revision 2643 by Fabian Heidemann on 2016-03-22T12:40:23Z:

[gallery] close DialogView on Dialog.close, fix #2291

• Revision 2643 by Fabian Heidemann on 2016-03-22T12:40:23Z:

[gallery] close DialogView on Dialog.close, fix #2291

• Revision 2731 by Fabian Heidemann on 2016-03-22T12:40:23Z:

[gallery] close DialogView on Dialog.close, fix #2291

• Revision 2731 by Fabian Heidemann on 2016-03-22T12:40:23Z:

[gallery] close DialogView on Dialog.close, fix #2291