add --must-filter, give error on filter not supported instead of warn

[jagprog5]

from: https://public-inbox.org/git/[email protected]/

CC: Jeff King [email protected]

[gitgitgadget]

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Changes since v1:
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- Added a code comment to ... as suggested by ...
...

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[gitgitgadget]

There is a merge commit in this Pull Request:

5ef848e519f9fafff0fdc0245e4984d54c25f1f5

Please rebase the branch and force-push.

[dscho]

/allow

[gitgitgadget]

User jagprog5 is now allowed to use GitGitGadget.

WARNING: jagprog5 has no public email address set on GitHub; GitGitGadget needs an email address to Cc: you on your contribution, so that you receive any feedback on the Git mailing list. Go to https://github.com/settings/profile to make your preferred email public to let GitGitGadget know which email address to use.

[jagprog5]

/preview

[gitgitgadget]

Error: Could not determine full name of jagprog5

[jagprog5]

/preview

[gitgitgadget]

Preview email sent as [email protected]

[jagprog5]

/submit

[gitgitgadget]

Submitted as [email protected]

To fetch this version into FETCH_HEAD:

git fetch https://github.com/gitgitgadget/git/ pr-1869/jagprog5/master-v1

To fetch this version to local tag pr-1869/jagprog5/master-v1:

git fetch --no-tags https://github.com/gitgitgadget/git/ tag pr-1869/jagprog5/master-v1