_writeCheckpoint() in Gauge use wrong index to get prevVoteStatus

Lines of code Vulnerability details Impact All the Voting values calculated by writeCheckpoint when it's not first checkpoint is going to set to False instead of account's last vote and because vote has been used in earned and reward calculation so reward distribution is going to be wrong too...

User rewards stop accruing after any _writeCheckpoint calling action

Lines of code Vulnerability details Any user balance affecting action, i.e. deposit, withdraw/withdrawToken or getReward, calls writeCheckpoint to update the balance records used for the earned reward estimation. The issue is that writeCheckpoint always sets false to voted flag for the each new...