There's nothing in the GPL about preserving git history. Git didn't even exist when GPLv2 was published. GPL requires proper copyright notice. Lemonade's license is v3 and Citra's license.txt is v1 from 1991, but the original Citra README indicates v2 or any later version.
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Re: Former Citra Dev Says Team Behind 3DS Emulator Lemonade Stole His Code
There's nothing in the GPL about preserving git history. Git didn't even exist when GPLv2 was published. GPL requires proper copyright notice. Lemonade's license is v3 and Citra's license.txt is v1 from 1991, but the original Citra README indicates v2 or any later version.