getting eclipse duplicate line shortcut to work on fedora 19 Ctrl+Alt+Up And Ctrl+Alt+Down
by default these key combination are mapped to the switch workplace up/down function and while in older fedora versions it was possible to disable them through Settings --> keyboard --> shortcut ... but this doesn't work any more.
open a console window (terminal) with the same user you use to run eclipse execute the following commands to free up the key binding
gsettings set org.gnome.desktop.wm.keybindings switch-to-workspace-down "['']"
gsettings set org.gnome.desktop.wm.keybindings switch-to-workspace-up "['']"
source: fedora bug report and workaround
