I like to use Eclipse\'s shortcut Ctrl + O which outlines the current source. Is there an equivalent shortcut in IntelliJ IDEA?
It opens a dial
For some Linux kinds, and particularly for XFCE (like Xubuntu, Mint XFCE) a lot of default XWin keyboard layout mappings are not working.
This is because they overlap with assigned Window Manager -> Keyboard shortcuts. For the concrete question Ctrl+F12 is assigned to Workspace 12 which I doubt that many use at all.
The solution is to clear those Window manager assignments in Window Manager -> Keyboard tab. As a temporal workaround you may use IDEA actions via Find action Ctrl+Shift+A
There are other overlapping short keys. References: