add "Verifying a Rebase" section to CONTRIBUTING.md (#3487)

Signed-off-by: Pasta <pasta@dashboost.org>
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@ -229,6 +229,25 @@ discussed extensively on the mailing list and IRC, be accompanied by a widely
discussed BIP and have a generally widely perceived technical consensus of being discussed BIP and have a generally widely perceived technical consensus of being
a worthwhile change based on the judgement of the maintainers. a worthwhile change based on the judgement of the maintainers.
#### Verifying a Rebase
When someone rebases their PR, it can often be very difficult to ensure that
extra changes were not included in that force push. This changes could be anything
from merge conflicts to someone attempting to sneak something into the PR. To check
that a PR is the same before and after force push, you can use the following function.
Place this function in your `~/.bashrc`. In order for this function to work, both the
before and after commits must be present locally.
```
function gfd() {
local fp1=$(git merge-base --fork-point develop $1)
local fp2=$(git merge-base --fork-point develop $2)
echo fp1=$fp1
echo fp2=$fp2
diff --color=always -u -I'^[^-+]' <(git diff $fp1..$1) <(git diff $fp2..$2)
}
```
### Finding Reviewers ### Finding Reviewers
The review process is normally fairly responsive on the Dash Core repository, however The review process is normally fairly responsive on the Dash Core repository, however