I believe there was controversy in the FOSS community over Microsoft's patent application for the concept: https://www.google.com/patents/US8255828 https://www.

I believe there was controversy in the FOSS community over Microsoft's patent application for the concept: https://www.google.com/patents/US8255828 https://www.google.com/patents/US8255828 I'd speculate that this patent application provided at least a small amount of hesitation towards the FOSS community implementing a similar interface.