Done (trunk r6601), I also added the ability to change fore- and background-color of CallTips ("stolen" from ScintillaBase and slightly modified).
Thanks. I had a look again at your changes. In fact, isn't it weird that the border had been there until now? I mean: If I got your changes right, then it was set implicitly to
wxBORDER_NONE, was it?! So the actual question is why this was
visible in the past... :shock:
However, it's back to "normal" now luckily.