See also commit 0e752070ac2bed02d0858bbc450ddcee36e3b9b5, which broke
source code listings in gdb unless you cd into i3/src. This should give
us best of both :-).
e.g. pressing Mod1+x when having the following in your configfile:
bindsym Mod1+x some invalid command
will lead to an i3-nagbar instance popping up, offering you to view the
error log (which will contain parser errors from this commit on).
