I'd be happy to be corrected by people with more direct knowledge if I've somehow misconstrued the situation.
That's part of what I don't understand though. Why did they choose to integrate webkit, but not Gecko?
Thats crystal clear, because Webkit is further development of KHTML, and KHTML was developed on KDE and used inside Qt for Konqueror web functionality.
So the origin of the problem was - why invent KHTML, when they couldīve used Gecko in Firefox 1.x era.