75290ae61e Drop us=... message in net debug for sending version message (Pieter Wuille)
5d47860334 refactor: move CAddress-without-nTime logic to net_processing (Pieter Wuille)
Pull request description:
Historically, the VERSION message contains an "addrMe" and an "addrYou". As these are sent before version negotiation is complete, the protocol version is INIT_PROTO_VERSION (209), and in that protocol, CAddress is serialized without nTime.
This is in fact the only situation left where a CAddress is (de)serialized without nTime. As it's such a simple structure (CService for ip/port + uint64_t for nServices), just inline that structure in the few places where it occurs, and remove the logic for dealing with missing nTime from CAddress.
ACKs for top commit:
Zero-1729:
crACK 75290ae61e
jonatack:
ACK 75290ae61e
vasild:
ACK 75290ae61e
Tree-SHA512: ccd9f478e1766fb2ad845d512b090e6297b82100640545ca490d930785801da3b429d40400bc2eb2cbe9057d5d12362ab33f8d650a1ca9e9e85857aef36ec414
127b4608e9 test: Check if specified config file cannot be opened (nthumann)
6bb54708e6 util: Check if specified config file cannot be opened (nthumann)
Pull request description:
Fixes https://github.com/bitcoin/bitcoin/issues/22612.
When running e.g. `./src/bitcoind -datadir=/tmp/bitcoin -regtest -conf=/tmp/bitcoin/regtest/bitcoin.conf` and the specified config cannot be opened (doesn't exist, permission denied, ...), the initialization silently uses the default config.
As voidburn already noted:
> I can't think of a situation in which a config file is specified explicitly (in the startup options, as per service unit linked above), but inaccessible, where the fail condition should be to keep booting using defaults instead.
With this patch applied, the initialization will fail immediately, if the specified config file cannot be opened. If no config file is explicitly specified, the behavior is unchanged. This not only affects `bitcoind`, but also `bitcoin-cli` and `bitcoin-qt`.
In the example below the datadir is accessible, but the config file is not due to insufficient permissions:
```
$ ./src/bitcoind -datadir=/tmp/bitcoin -regtest --debug=1 -conf=/tmp/bitcoin/regtest/bitcoin.conf
Error: Error reading configuration file: specified config file "/tmp/bitcoin/regtest/bitcoin.conf" could not be opened.
```
ACKs for top commit:
0xB10C:
ACK 127b4608e9
Zero-1729:
tACK 127b4608e9
theStack:
Tested ACK 127b4608e9
Tree-SHA512: 4fe487921485426f1d1da8d256c388af517b984b639d776aec7b159b3e23b669824093d3bdd31139d9415ed5f5de405b3e6a51b110c8ab471f12b9c99ac67cc1
a38137479b net: do not advertise address where nobody is listening (Jadi)
Pull request description:
If the bitcoind starts when listen=0 but listenonion=1, the daemon will
advertise its onion address but nothing is listening for it.
This update will enforce listenonion=0 when the listen is 0.
ACKs for top commit:
vasild:
ACK a38137479b
jarolrod:
ACK a38137479b
amitiuttarwar:
ACK a38137479b
Tree-SHA512: e84a0a9a51f2217edf35d06c6cd9085d1e664452655ba92027195a1e88ba081d157310c84e9709a99ce5d46c94f231477ca2d36f010648b0c8b4f2a737d54e5d
08f57a0057 Assert that IsComplete() in GetSpendData() (Pieter Wuille)
d8f4b976d5 Remove default nHashTypeIn arguments to MutableTransactionSignatureCreator (Pieter Wuille)
c7048aae95 Simplify SignTransaction precomputation loop (Pieter Wuille)
addb9b5a71 Improve comments in taproot signing logic (Pieter Wuille)
Pull request description:
This addresses a few review comments from #21365 that were left at the time of merge (as well as some from #22166 applying to the commit it shared with #21365).
I do not think any are blockers for a 22.0 release.
ACKs for top commit:
theStack:
re-ACK 08f57a0057🌴
Zero-1729:
crACK 08f57a0
jonatack:
Code review ACK 08f57a0057 per `git range-diff e9d6eb1 9336670 08f57a0` followed by re-code review per commit to swap context back into memory and debug build/run unit tests + feature_taproot.py as a sanity check
Tree-SHA512: 968750109ba8d6faf3016035a38f81c6aefb724c632a3cab0bbf43cf31b9d187b6b0fddd8772768f57338df11eb07ab9c4c6dacdf3cf35b71f29699c67a301ea
2f0190320d Avoid temporary vectors/uint256s in VerifyTaprootCommitment (Pieter Wuille)
Pull request description:
As XOnlyPubKey has a Span-based constructor, that can be used directly without needing to first convert the byte sequence into a vector, only to convert that to a uint256, which only then can then be passed as a span to the constructor.
Reported by @ roconnor-blockstream.
ACKs for top commit:
Zero-1729:
crACK 2f0190320d
theStack:
re-ACK 2f0190320d
jonatack:
ACK 2f0190320d
Tree-SHA512: f5e809d693cf6f6e899278cd706548eb4341e73b3f7ca8926b5fb50afb2098077d691579aea84fd7db2a7edd76be8e400aa2ed886091ee3416651b8a36efba37
The us=... message in the debug log when sending a version message is
always [::]:0, because we no longer send our own address there.
Therefore, this information is entirely redundant. Remove it.
Historically, the VERSION message contains an "addrMe" and an "addrYou". As
these are sent before version negotiation is complete, the protocol version is
INIT_PROTO_VERSION (209), and in that protocol, CAddress is serialized without
nTime.
This is in fact the only situation left where a CAddress is (de)serialized
without nTime. As it's such a simple structure (CService for ip/port + uint64_t
for nServices), just inline that structure in the few places where it occurs,
and remove the logic for dealing with missing nTime from CAddress.
021daedfa1 refactor: replace remaining binascii method calls (Zero-1729)
Pull request description:
This PR removes the remaining `binascii` method calls outside `test/functional` and `test_framework`, as pointed out here https://github.com/bitcoin/bitcoin/pull/22619#pullrequestreview-722153458.
Follow-up to #22593 and #22619
Closes #22605
ACKs for top commit:
josibake:
re-ACK 021daedfa1
theStack:
re-ACK 021daedfa1
Tree-SHA512: 2ae9fee8917112c91a5406f219ca70f24cd8902b903db5a61fc2de85ad640d669a772f5c05970be0fcee6ef1cdd32fae2ca5d1ec6dc9798b43352c8160ddde6f
As XOnlyPubKey has a Span-based constructor, that can be used directly
without needing to first convert the byte sequence into a vector, only
to convert that to a uint256, which only then can then be passed as a
span to the constructor.
4d2fa97031 [addrman] Clean up ctor (John Newbery)
7e6e65918f [addrman] inline Clear() into CAddrMan ctor (John Newbery)
406be5ff96 [addrman] Remove all public uses of CAddrMan.Clear() from the tests (John Newbery)
ed9ba8af08 [tests] Remove CAddrMan.Clear() call from CAddrDB::Read() (John Newbery)
e8e7392311 [addrman] Don't call Clear() if parsing peers.dat fails (John Newbery)
181a1207ba [addrman] Move peers.dat parsing to init.cpp (John Newbery)
Pull request description:
`CAddrMan::Clear()` exists to reset the internal state of `CAddrMan`. It's currently used in two places:
- on startup, if deserializing peers.dat fails, `Clear()` is called to reset to an empty addrman
- in tests, `Clear()` is called to reset the addrman for more tests
In both cases, we can simply destruct the `CAddrMan` and construct a new, empty addrman. That approach is safer - it's possible that `Clear()` could 'reset' the addrman to a state that's not equivalent to a freshly constructed addrman (one actual example of this is that `Clear()` does not clear the `m_tried_collisions` set). On the other hand, if we destruct and then construct a fresh addrman, we're guaranteed that the new object is empty.
This wasn't possible when addrman was initially implemented, since it was a global, and so it would only be destructed on shutdown. However, addrman is now owned by `node.context`, so we have control over its destruction/construction.
ACKs for top commit:
laanwj:
Code review ACK 4d2fa97031
vasild:
ACK 4d2fa97031
Zero-1729:
crACK 4d2fa97031
Tree-SHA512: f715bf2cbff4f8c3a9dbc613f8c7f11846b065d6807faf3c7d346a0b0b29cbe7ce1dc0509465c2c9b88a8ad55299c9182ea53f5f743e47502a69a0f375e09408
Clear() is now only called from the ctor, so just inline the code into
that function.
The LOCK(cs) can be removed, since there can be no data races in the ctor.
Also move the function definition out of the header and into the cpp file.
Just use unique_ptr<CAddrMan>s and reset the pointer if a frest addrman is required.
Also make CAddrMan::Clear() private to ensure that no call sites are missed.
cd37356ff9 [crypto] Fix K1/K2 use in ChaCha20-Poly1305 AEAD (Dhruv Mehta)
Pull request description:
BIP324 mentions K1 is used for the associated data and K2 is used for the payload. The code does the opposite. This is not a security problem but will be a problem across implementations based on the HKDF key derivations.
BIP324 author Jonas Schnelli thinks a [code update will be better](https://github.com/bitcoin/bitcoin/pull/15649#discussion_r440780669) than a BIP update.
If this PR is merged:
- [ ] We need to update the test vector 3 in BIP324
ACKs for top commit:
jonasschnelli:
utACK cd37356ff9
Tree-SHA512: e2165117bfbf7a031060e7376912f9af1c1bfc57916383799a0fa2c040e2caaab0d6aafc3425c083a233b96c84fafec75c938e00ceb6bd7d52607d58607cb145
f12fbad5a1 windres: use PACKAGE_VERSION rather than building more version numbers (fanquake)
Pull request description:
Rather than defining more strings, reuse PACKAGE_VERSION, which is already available.
We also already use PACKAGE_VERSION for `ProductVersion` and `FileVersion` in setup.nsi.
ACKs for top commit:
MarcoFalke:
cr ACK f12fbad5a1
laanwj:
Code review ACK f12fbad5a1
Tree-SHA512: b74a37cbba105d208d4da9264d295d7e052009fdd6b0ed54a0d9968bbe2deeba1766d6d310438b2939a81555faa0cbd67d5e53f0c8a2de669ce56353c1c67d22
`bool CAddrDB::Read(CAddrMan& addr, CDataStream& ssPeers)` is _only_
called from the tests, and the call to addr.Clear() only exists so that
a test that Clear() is called passes. Remove that test and the call.
Now that we manage the lifespan of node.addrman, we can just reset
node.addrman to a newly initialized CAddrMan if parsing peers.dat
fails, eliminating the possibility that Clear() leaves some old state
behind.
aaa6ad5455 [MOVEONLY] [tests] Move addrman ser/deser tests to addrman_tests.cpp (John Newbery)
Pull request description:
Addrman serialization/deserialization tests are currently in net_tests.cpp.
Move them to addrman_tests.cpp with the rest of the addrman tests.
Reviewer hint: review using `git diff --color-moved=dimmed-zebra`
ACKs for top commit:
MarcoFalke:
review ACK aaa6ad5455📺
mjdietzx:
ACK aaa6ad5455
Saviour1001:
Concept ACK <code>[aaa6ad5](aaa6ad5455)</code>
Tree-SHA512: 9a575e63f8830a9dfba30ef63c83ae4b45813add9973308f0d7a2463886438575a2e8a4a23af5b19ed977fbaab1a212ef832f89a25de03920d493e9ebafa9c30
5c5d0b6264 Add FoundBlock.found member (Russell Yanofsky)
Pull request description:
This change lets IPC serialization code handle FoundBlock arguments more simply and efficiently. Without this change there was no way to determine from a FoundBlock object whether a block was found or not. So in order to correctly implement behavior of leaving FoundBlock output variables unmodified when a block was not found, IPC code would have to read preexisting output variable values from the local process, send them to the remote process, receive output values back from the remote process, and save them to output variables unconditionally. With FoundBlock.found method, the process is simpler. There's no need to read or send preexisting local output variable values, just to read final output values from the remote process and set them conditionally if the block was found.
---
This PR is part of the [process separation project](https://github.com/bitcoin/bitcoin/projects/10). The commit was first part of larger PR #10102.
ACKs for top commit:
fjahr:
Code review ACK 5c5d0b6264
theStack:
Concept and code review ACK 5c5d0b6264
jamesob:
ACK 5c5d0b6264 ([`jamesob/ackr/22215.1.ryanofsky.refactor_add_foundblock`](https://github.com/jamesob/bitcoin/tree/ackr/22215.1.ryanofsky.refactor_add_foundblock))
Zero-1729:
crACK 5c5d0b6
Tree-SHA512: d906e1b7100ff72c3aa06d80bd77673887b2db670ebd52dce7c4f6f557a23a1744c6109308228a37fda6c6ea74f05ba0efecff0ef235ab06ea8acd861fbb8675
Addrman serialization/deserialization tests are currently in net_tests.cpp.
Move them to addrman_tests.cpp with the rest of the addrman tests.
Reviewer hint: review using `git diff --color-moved=dimmed-zebra`
Rather than defining more strings, reuse PACKAGE_VERSION, which is
already available.
We already use PACKAGE_VERSION for `ProductVersion` and `FileVersion` in setup.nsi.
60e0cbdd57 [addrman] Merge the two Add() functions (Amiti Uttarwar)
Pull request description:
This PR merges the two definitions of this overloaded function to reduce code duplication.
When these functions were introduced in 5fee401fe1, there were multiple places that invoked `Add()` with a single addr and a vector of addrs each, so it made sense to overload the function. I could see how the small difference in log statement was more meaningful when a peer was added via IRC :)
Now, the definition of `Add()` that takes in a single address is only invoked from the hidden/test-only RPC `addpeeraddress`. These changes should not cause any observable difference, and are covered by the existing tests that use this RPC endpoint.
ACKs for top commit:
jnewbery:
Code review ACK 60e0cbdd57
Zero-1729:
crACK 60e0cbd
fanquake:
ACK 60e0cbdd57
Tree-SHA512: 782fb2ac6d2d403ba7d7ff543197ca42b610b9a8806952d271e57e2ee3527ad1a94af4ebbad5371b5e95d77df07c56ccc8c1d5a2c82cdecb0d2b5085b3bdd5ee
2d7534bd93 wallet: use PACKAGE_NAME instead of "Bitcoin" in rpcdump (fanquake)
14b4802405 wallet: use FormatFullVersion instead of CLIENT_BUILD in rpcdump (fanquake)
Pull request description:
The dumpwallet RPC is the last place we're using CLIENT_BUILD directly, rather FormatFullVersion() (which just returns it), so switch to using that. At the same time, use PACKAGE_NAME (Bitcoin Core), rather than just "Bitcoin".
ACKs for top commit:
MarcoFalke:
cr ACK 2d7534bd93
laanwj:
Tested ACK 2d7534bd93
achow101:
ACK 2d7534bd93
Zero-1729:
crACK 2d7534b
Tree-SHA512: b38ee074e317448719d2a628380786ec665413515b38d9ce680c21608bc2acf6a2bf817f78f100a8310477613ae72d6969cc4f595f4f44af0896659d3ebf2671
fa7718344d fuzz: Avoid OOM in system fuzz target (MarcoFalke)
Pull request description:
If the inputs size is unlimited, the target may consume unlimited memory, because the argsmanager stores the argument names. Limiting the size should fix this issue.
Should fix https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=36906
ACKs for top commit:
practicalswift:
cr ACK fa7718344d
Tree-SHA512: 6edfcf324ee9d94e511038ee01340f02db50bcb233af3f1a1717c3602164c88528d9d987e971ec32f1a4593b868019bea0102c53c9b02bfefec3dfde959483cf
5100deee58 clientversion: No suffix #if CLIENT_VERSION_IS_RELEASE (Carl Dong)
Pull request description:
```
Previously, building from a release source tarball would result in a
version string like v22.0.0-<commithash>, but we expect just v22.0.0.
This commit solves this problem.
Also use PACKAGE_VERSION instead of reconstructing it.
```
Fixes the underlying problem of #22623
ACKs for top commit:
achow101:
ACK 5100deee58
fanquake:
ACK 5100deee58 - tested that prior the output of `src/bitcoind -version` on the `22.x` branch was `Bitcoin Core version v22.0.0-d3bd5410f64e`, and with this commit cherry-picked it is `Bitcoin Core version v22.0.0rc2`.
Tree-SHA512: 78705e285ff1271d5012e888837049044db4d11d66c252c6b964685892ef078c56fe122f12daa87c71532f4352f695d1e88a228665adcd7afe3ddce3f209b49f
92885c4f69 test: Test for ApproximateBestSubset edge case with too little fees (Andrew Chow)
d9262324e8 wallet: Assert that enough was selected to cover the fees (Andrew Chow)
2de222c401 wallet: Use GetSelectionAmount for target value calculations (Andrew Chow)
Pull request description:
The `m_value` used for the target calculation in `ApproximateBestSubset` is incorrect, it should be `GetSelectionAmount`. This causes a bug that is only apparent when the minimum relay fee is set to be very high.
A test case is added for this, in addition to an assert in `CreateTransactionInternal` that would have also caught this issue if someone were able to hit the edge case.
Fixes #22670
ACKs for top commit:
instagibbs:
utACK 92885c4f69
Tree-SHA512: bd61fa61ffb60873e097737eebea3afe8a42296ba429de9038b3a4706763b34de9409de6cdbab21ff7f51f4787b503f840873182d9c4a1d6e12a54b017953547
5fe8100ff3 Change the wallet_backup.py test to use the restorewallet RPC command instead of restoring wallets manually. (lsilva01)
ae23faba6f Add a new RPC command: restorewallet (lsilva01)
Pull request description:
As far as I know, there is no command to restore the wallet from a backup file.
The only way to do this is to replace the `wallet.dat` of a newly created wallet with the backup file, which is hardly an intuitive way.
This PR implements the `restorewallet` RPC command which restores the wallet from the backup file.
To test:
First create a backup file:
`$ bitcoin-cli -rpcwallet="wallet-01" backupwallet /home/Backups/wallet-01.bak`
Then restore it in another wallet:
`$ bitcoin-cli restorewallet "restored-wallet-01" /home/Backups/wallet-01.bak`
ACKs for top commit:
achow101:
re-ACK 5fe8100ff3
prayank23:
tACK 5fe8100ff3
meshcollider:
utACK 5fe8100ff3
Tree-SHA512: 9639df4d8ad32f255f5b868320dc69878bd9aceb3b471b49dfad500b67681e2d354292b5410982fbf18e25a44ed0c06fd4a0dd010e82807c2e00ff32e84047a1
4844b74ba7 p2p: log addrman consistency checks (Jon Atack)
Pull request description:
This mini-patch picks up #22479 to log addrman consistency checks in the `BCLOG::ADDRMAN` category when they are enabled with the `-checkaddrman=<n>` configuration option for values of n greater than 0.
```
$ ./src/bitcoind -signet -checkaddrman=20 -debug=addrman
...
2021-08-13T11:14:45Z Addrman checks started: new 3352, tried 89, total 3441
2021-08-13T11:14:45Z Addrman checks completed successfully
```
This allows people to
- verify the checks are running
- see when and how often they are being performed
- see the number of new/tried/total addrman entries per check
- see the start/end of the checks
Thanks to John Newbery for ideas to improve this logging.
ACKs for top commit:
jnewbery:
Code review ACK 4844b74ba7
Zero-1729:
tACK 4844b74ba7
theStack:
Concept and code-review ACK 4844b74ba7♟️
Tree-SHA512: 10b51c480d52a753ea8a59dbdd1e2c4f49067e7f4afe59d58426a8fb438f52447fe3a6090fa52132bc382d876927fa338b229c906d85668086f7f8f5bd8ed38a
d930c7f5b0 p2p, rpc, test: address rate-limiting follow-ups (Jon Atack)
Pull request description:
Incorporates review feedback in #22387.
Edit, could be considered separately: should a release note (or two) be added for 22.0? e.g. the new getpeerinfo fields in `Updated RPCs` and the rate-limiting itself in `P2P and network changes`.
ACKs for top commit:
MarcoFalke:
review ACK d930c7f5b0
theStack:
re-ACK d930c7f5b0🌮
Zero-1729:
crACK d930c7f
Tree-SHA512: b2101cad87f59c238603f38bd8e8df7a4d48929794e4de9e0e0ff2afa935a68475c2d369aa669d124a0bec2f50280fb47e8b980bde6ad812db08cf67b71c066a
a4d78546b0 [addrman] Make addrman consistency checks a runtime option (John Newbery)
10aac24145 [tests] Make deterministic addrman use nKey = 1 (John Newbery)
fa9710f62c [addrman] Add deterministic argument to CAddrMan ctor (John Newbery)
ee458d84fc Add missing const to CAddrMan::Check_() (MarcoFalke)
Pull request description:
CAddrMan has internal consistency checks. Currently, these are only run when the program is compiled with the `DEBUG_ADDRMAN` option. This option is not enabled on any of our CI builds, and it's likely that no-one is running them at all.
This PR makes consistency checks a (hidden) runtime option that can be enabled with `-checkaddrman`, where `-checkaddrman=n` will result in the consistency checks running every n operations (similar to `-checkmempool=n`). We set the ratio to 1/100 for our unit tests, and leave it disabled by default for all networks. Additionally, a consistency check failure now asserts, rather than logging and continuing. This matches the behavior of CTxMemPool and TxRequestTracker, where a failed consistency check asserts.
ACKs for top commit:
jonatack:
ACK a4d78546b0 per `git diff 00fd089 a4d7854`, tested by adding logging similar to #22479 and running with `-checkaddrman=<n>` for various values 0/1/10/100 etc, tested the updated docs with `bitcoind -help-debug | grep -A2 "checkaddrman\|checkmempool"` and verified rebased on master that compiling with `CPPFLAGS="-DDEBUG_ADDRMAN"` no longer causes the build to error.
mzumsande:
Code-review ACK a4d78546b0
theStack:
Code-review ACK a4d78546b0
Tree-SHA512: eaee003f7a99154822c5b5efbc62008d32c1efbecc6fec6e183427f6b2ae5d30b3be7924e3a7271b1a1de91517f5bd2a70011d45358c3105c6a0702f12b70f7c
When the fee is not subtracted from the outputs, the amount that has
been reserved for the fee (change_and_fee - change_amount) must be
enough to cover the fee that is needed. It would be a bug to not do so,
so use an assert to make this obvious if such a situation were to occur.
For target value calculations, GetSelectionAmount should be used, not
m_effective_value or m_value.
Specifically, ApproximateBestSubset mistakenly uses m_value when
calculating whether the target value has been met. This has been changed
to use GetSelectionAmount.
93cc53a2b2 gui: Unregister wallet notifications before unloading wallets (Russell Yanofsky)
Pull request description:
This change was originally part of both bitcoin/bitcoin#10102 and bitcoin/bitcoin#19101 and is required for both because it avoids the IPC wallet implementation in bitcoin/bitcoin#10102 and the WalletContext implementation in bitcoin/bitcoin#19101 needing to deal with notification objects that have stale pointers to deleted wallets.
ACKs for top commit:
promag:
Code review ACK 93cc53a2b2.
hebasto:
ACK 93cc53a2b2
Tree-SHA512: 805f50a493291ad0f7c48725fbc5058d58ebbdb0770befd51d8aa241209a13f8a46f5982481336ab8338cdc83e9017668089a71deccf1587308e841cf8697825
Currently addrman consistency checks are a compile time option, and are not
enabled in our CI. It's unlikely anyone is running these consistency checks.
Make them a runtime option instead, where users can enable addrman
consistency checks every n operations (similar to mempool tests). Update
the addrman unit tests to do internal consistency checks every 100
operations (checking on every operations causes the test runtime to
increase by several seconds).
Also assert on a failed addrman consistency check to terminate program
execution.
62b125fd19 qt, refactor: Fix indentation (Prateek Sancheti)
ad28b66e98 qt: Add SubFeeFromAmount option (Prateek Sancheti)
Pull request description:
This PR adds **_SubFeeFromAmount_** option which lets the user select their preferred setting of whether fee for a transaction is to be subtracted from the amount or not for future transactions. The setting chosen by the user is remembered even when the GUI mode is turned off.
**_Functionality and Usage:_**
- Go to `Settings > Options > Wallet` on _Windows/Linux_ or `bitcoin-qt > Preferences > Wallet` on _macOS_.
- The checkbox **Subtract Fee From Amount** corresponds to the added option **SubFeeFromAmount**.
- The preferred setting intended to be the default for all future send transactions should be selected by the user.
- Click on **OK**.
- Go to the **Send** tab in the wallet.
- You shall notice, any new Send transaction created will have the preferred setting as chosen by the user.<br> (Try clicking on Add recipient or even restarting the Node in GUI)
Attaching ScreenRecordings to explain the added feature.
> Master.mov: Master Branch
https://user-images.githubusercontent.com/54016434/127763378-be91837d-d0ab-4ae5-87c0-d303fa70a336.mov
> PR.mov: PullRequest
https://user-images.githubusercontent.com/54016434/127763404-05b834c1-4082-4fbd-9b05-1528ac898a21.mov
Close #386
ACKs for top commit:
Talkless:
tACK 62b125fd19, tested on Debian Sid with 5.15.2 and it works as described.
hebasto:
re-ACK 62b125fd19, only removed the unused `SubFeeFromAmountChanged` signal since my [previous](https://github.com/bitcoin-core/gui/pull/390#pullrequestreview-726531766) review.
meshcollider:
utACK 62b125fd19
Tree-SHA512: 932ca89ae578a1e1c426561400d87cf005c231944feaf0f662ff8d88f32bdd65a927a090ea41510a15f8ec0ebcd5529672e9917720eb5ea85f413f081e45d5bb
