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net: peer manager, dynamically adjust 'initial sync finished' flag
By dynamically adjusting the flag based on the node's proximity to the tip, we ensure that the new connections desirable services flags and the extra block relay connections stay relevant throughout the software's lifecycle. Unlike the previous approach, where once the validation IBD flag was set, it remained constant forever. This will let us recover from stalling scenarios where the node had successfully synced, but subsequently dropped connections and remained inactive for a duration longer than the limited peers threshold (the timeframe within which limited peers can provide blocks). Then, upon reconnection to the network, the node may end up only establishing connections with limited peers, leading to an inability to synchronize the chain. Additionally, this change prevents the node from initiating extra block relay connections during this type of stalling situations.
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