Allow safe owners to remove transaction requests that only they have signed

[Arachnid]

It'd be incredibly useful if there was a UI option to 'remove' a transaction request that has only been signed by the current keyholder from the UI. There's little reason to go through a multisig 'cancel' process in such cases.

[fernandomg]

@Arachnid,

A workaround I can think of for that particular case is that when you create a different transaction, you set the same nonce of the transaction you want to 'remove'.

This way you won't be wasting gas by cancelling a transaction, but you'll be replacing it instead.

That can be done with the advanced transaction parameters.

[Arachnid]

Unfortunately that results in a very confusing UX - you have to tell all the other keyholders "approve the transaction with nonce x and hash y, not the otherwise identical one with hash z"