Import clipboard using keys, fullscreen crashes to desktop.

[lawndart]

Xnview crashes when importing clipboard while in full-screen mode.

1. View image in full screen.
2. Press print <Print Screen>
3. press <ctrl shift v>
4. It crashes to destop

[lawndart]

Often, performing the steps above displays an odd toolbar with multiple
xnview & window sizing icons on it instead of crashing. Putting
text into clipboard always crashes it in full-screen mode.

[xnview]

Xnview crashes when importing clipboard while in full-screen mode.

1. View image in full screen.
2. Press print <Print Screen>
3. press <ctrl shift v>
4. It crashes to destop

Ok, i'll fix it