trace-graph: Fix printing of event labels
trace-graph: Fix printing of event labels

Make the printing of event labels a bit more sophisicated. That is
to print the event label when there is enough room before and
after the event. If one label is small, let another larger label
use up that space.

Signed-off-by: Steven Rostedt <43232e92d70cc7aa53504ad0397085ee47bad87f@goodmis.org>

bigzz/trace-cmd,bigzz/trace-cmd