UI bug causes excessive transaction fees

[BitcoinsPakistan]

Hello

There is a UI bug on http://brainwallet.org/#tx that can cause the json transaction to not update. if you change the figure next to the destination address the json transaction updates and the appropriate change is sent back to the source address. But if you change the source amount only the transaction does not update meaning you end up paying more as fees.

https://bitcointalk.org/index.php?topic=372725.0

[brainwallet]

Made it read only in a9c4faf
You still may shoot yourself in the foot using "Edit Inputs", I can't really fix that.