[unstable2507] Backport #8108 #9789
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…s for a new reserve (#8108) # Description Solves: #8099 Based on the documentation and existing code, the usable balance is computed with the following formula: ```rs // If Fortitude == Polite let usable_balance = free - max(frozen - reserved, existential balance) ``` ### The problem: If an account's `free balance` is lower than `frozen balance`, no reserves will be allowed even though the `usable balance` is enough to cover the reserve, resulting in a `LiquidityRestrictions` error, which should not happen. ### Visual example of how `usable/spendable` balance works: ```bash |__total__________________________________| |__on_hold__|_____________free____________| |__________frozen___________| |__on_hold__|__ed__| |__untouchable__|__spendable__| ``` ## Integration No action is required, the changes only change existing code, it does not add or change any API. ## Review Notes From my understanding, the function `ensure_can_withdraw` is incorrect, and instead of checking that the new `free` balance is higher or equal to the `frozen` balance, it should make sure the `new free` balance is higher or equal to the `usable` balance. --------- Co-authored-by: Kian Paimani <[email protected]> (cherry picked from commit 7c2642d)
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Bump pallet-balances to include SDK PR [#9789](paritytech/polkadot-sdk#9789).
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Bump pallet-balances to include SDK PR [#9789](paritytech/polkadot-sdk#9789).
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Backport #8108 into
unstable2507from RomarQ.See the documentation on how to use this bot.