i just found a bug you can't recover from:

have this sketch:
Code:

int[] ints;
void setup(){
size( 100,100);
// -- from
ints = new int[10];
// to --
}
void draw(){
for (int i=0; i<100; i++)
{
ints[i]++;  // raise exception here
}
}
 

now save, cut (command-x) the part marked --from - to--,
don't save but run the sketch ...

an exception is raised ok, now undo the cutting (command-z) ...

first the undo-code is inserted at a wrong position and without line-breaks, then pressing undo inserts it again (why?), now i have parts of my sketch (everything above the undo) i can't select anymore ...

best,
F