feat: "send max" affordance — emptying an ETH account now requires manual arithmetic #198

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2026-08-11T14:22:57+02:00

clawbot commented

2026-08-11 14:22:57 +02:00

#154 makes the confirmation screen correctly refuse a send whose amount plus network fee exceeds the balance. Correct, but it leaves no way to empty an account: the user must guess an amount, get refused, and adjust — with the fee moving under them between estimates.

Deliberately left out of scope there; filing it rather than losing it. Not milestoned — move it into 1.0.0 if you consider "cannot send your whole balance" a 1.0 defect rather than a missing convenience.

Implementation requirements

Compute max from the exact wei balance minus the live fee estimate, not from the truncated display balance. src/shared/balances.js may need to expose the untruncated value.
Re-derive whenever the fee estimate updates; a max amount pinned to a stale estimate is the same bug #154 fixed.
validateTransfer() in src/shared/txValidation.js stays the gate — a max send must pass it, not bypass it.
For ERC-20, max is the full token balance and is unaffected by the fee, but the ETH-for-gas check still applies.
Follow the README Language & Labeling and No Layout Shift rules.

Definition of done

A max ETH send leaves exactly the estimated fee behind and the confirmation screen enables Send.
The max amount re-derives when the fee estimate changes.
A max ERC-20 send offers the full token balance and is still refused when ETH cannot cover gas.
Unit tests cover the max computation against the exact-wei balance, demonstrated failing first.
TODO.md updated in the same commit.
make check passes.

https://git.eeqj.de/sneak/AutistMask/issues/154 makes the confirmation screen correctly refuse a send whose amount plus network fee exceeds the balance. Correct, but it leaves no way to empty an account: the user must guess an amount, get refused, and adjust — with the fee moving under them between estimates. Deliberately left out of scope there; filing it rather than losing it. Not milestoned — move it into 1.0.0 if you consider "cannot send your whole balance" a 1.0 defect rather than a missing convenience. ## Implementation requirements - Compute max from the exact wei balance minus the live fee estimate, not from the truncated display balance. `src/shared/balances.js` may need to expose the untruncated value. - Re-derive whenever the fee estimate updates; a max amount pinned to a stale estimate is the same bug https://git.eeqj.de/sneak/AutistMask/issues/154 fixed. - `validateTransfer()` in `src/shared/txValidation.js` stays the gate — a max send must pass it, not bypass it. - For ERC-20, max is the full token balance and is unaffected by the fee, but the ETH-for-gas check still applies. - Follow the README Language & Labeling and No Layout Shift rules. ## Definition of done - [ ] A max ETH send leaves exactly the estimated fee behind and the confirmation screen enables Send. - [ ] The max amount re-derives when the fee estimate changes. - [ ] A max ERC-20 send offers the full token balance and is still refused when ETH cannot cover gas. - [ ] Unit tests cover the max computation against the exact-wei balance, demonstrated failing first. - [ ] `TODO.md` updated in the same commit. - [ ] `make check` passes.

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Reference: sneak/AutistMask#198