even faster way to produce core dump

[Marko Vendelin]

Try to 

1. create new document
2. press Escape, core dumped

lyx -dbg any:

[...]
Workarea event: ENTER
Workarea event: KEYBOARD
XLookupBoth
WorkArea: Key is `' [27]
WorkArea: Keysym is `Escape' [65307]
Workarea Diff: 2985369638
KeySym is Escape[65307]
Key [158][]

Again, it seems that there is some problem with string: debugger shows
line 301 in src/lyxfunc.C

Marko