Prevent adding transtions where states are not added

[syntheticpp]

Current recursive adding of states does not work.

The old code tries to catch this,

  QState *parentState = state->parentState();
  if (parentState) {
    addStateOnly(parentState); // be sure that parent is added first
  }

but this does not work, because a unadded state could be used in addTransition(), then the graphs shows dangling states.

[krf]

Hm, actually I'd like to get rid off the filtering on the server-side completely, so I don't really want to add even more code handling this here.

Isn't the following hunk the only code needed to fix this issue for you?

+  // TODO also show targetless transitions
+  if (!targetState)
+      return;

[syntheticpp]

No, the problem is that existsing states are reported in the wrong order.

[syntheticpp]

Just discovered KDSME, looks very nice within Gammary!

But this patch is still needed.

(I wonder how simple your state charts must be, or maybe you just don't dogfood yourself.)