I want to know the answer to the following question:
What was done to the Quranic text early in its history leaving few markedly different variants?
All the background I'm provided with is that "University of Chicago professor Fred Donner states that "...there was a very early attempt to establish a uniform consonantal text of the Qurʾān from what was probably a wider and more varied group of related texts in early transmission.". Is that enough to answer the question?
Answer: no