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doc: fix merge-base ASCII art tab spacing
The doc-tool stack does not always respect the 'tab = 8 spaces' rule, particularly the git-scm doc pages https://git-scm.com/docs/git-merge-base and the Git generated html pages. Use just spaces within the block of the ascii art. Noticed when reviewing Junio's suggested update to `git merge-base` https://public-inbox.org/git/xmqqmvi2sj8f.fsf@gitster.mtv.corp.google.com/T/#u Signed-off-by: Philip Oakley <philipoakley@iee.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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@ -80,8 +80,8 @@ which is reachable from both 'A' and 'B' through the parent relationship.
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For example, with this topology:
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o---o---o---B
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/
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o---o---o---B
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/
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---o---1---o---o---o---A
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the merge base between 'A' and 'B' is '1'.
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@ -116,11 +116,11 @@ the best common ancestor of all commits.
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When the history involves criss-cross merges, there can be more than one
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'best' common ancestor for two commits. For example, with this topology:
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---1---o---A
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\ /
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X
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/ \
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---2---o---o---B
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---1---o---A
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\ /
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X
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/ \
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---2---o---o---B
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both '1' and '2' are merge-bases of A and B. Neither one is better than
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the other (both are 'best' merge bases). When the `--all` option is not given,
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@ -154,13 +154,13 @@ topic origin/master`, the history of remote-tracking branch
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`origin/master` may have been rewound and rebuilt, leading to a
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history of this shape:
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o---B1
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/
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o---B1
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/
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---o---o---B2--o---o---o---B (origin/master)
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\
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B3
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\
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Derived (topic)
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\
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B3
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\
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Derived (topic)
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where `origin/master` used to point at commits B3, B2, B1 and now it
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points at B, and your `topic` branch was started on top of it back
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