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Merge #260: Handle exceptions instead of crash
b8e5d0d qt: Handle exceptions in SendCoinsDialog::sendButtonClicked slot (Hennadii Stepanov) 1ac2bc7 qt: Handle exceptions in TransactionView::bumpFee slot (Hennadii Stepanov) bc00e13 qt: Handle exceptions in WalletModel::pollBalanceChanged slot (Hennadii Stepanov) eb6156b qt: Handle exceptions in BitcoinGUI::addWallet slot (Hennadii Stepanov) f7e260a qt: Add GUIUtil::ExceptionSafeConnect function (Hennadii Stepanov) 64a8755 qt: Add BitcoinApplication::handleNonFatalException function (Hennadii Stepanov) af7e365 qt: Make PACKAGE_BUGREPORT link clickable (Hennadii Stepanov) Pull request description: This PR is an alternative to bitcoin/bitcoin#18897, and is based on Russ' [idea](bitcoin/bitcoin#18897 (review)): > IMO it would be nice to have a followup PR that eliminated the one-line forwarding methods ... Related issues - #91 - bitcoin/bitcoin#18643 Qt docs: https://doc.qt.io/qt-5.12/exceptionsafety.html#exceptions-in-client-code With this PR the GUI handles the wallet-related exception, and: - display it to a user: ![Screenshot from 2021-04-01 02-55-59](https://user-images.githubusercontent.com/32963518/113226183-33ff8480-9298-11eb-8fe6-2168834ab09a.png) - prints a message to `stderr`: ``` ************************ EXCEPTION: 18NonFatalCheckError wallet/wallet.cpp:2677 (IsCurrentForAntiFeeSniping) Internal bug detected: '!chain.findBlock(block_hash, FoundBlock().time(block_time))' You may report this issue here: https://github.com/bitcoin/bitcoin/issues bitcoin in QPushButton->SendCoinsDialog ``` - writes a message to the `debug.log` - and, if the exception is a non-fatal error, leaves the main window running. ACKs for top commit: laanwj: Code review ACK b8e5d0d ryanofsky: Code review ACK b8e5d0d. This is great! I think more improvements are possible but implementation is very clean and I love how targeted each commit is. Changes since last review: adding more explanatory text, making links clickable, reorganizing. Tree-SHA512: a9f2a2ee8e64b993b0dbc454edcbc39c68c8852abb5dc1feb58f601c0e0e8014dca81c72733aa3fb07b619c6f49b823ed20c7d79cc92088a3abe040ed2149727
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