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rebase -i: style fixes and minor cleanups
This patch indents ";;" consistently with the rest of git's shell scripts,
and makes sure that ";;" are before each "esac".
It introduces a helper function "has_action", to make it easier to read
the intentions of the code.
Errors from "git rev-parse --verify" are no longer ignored.
Spaces are quoted using single quotes instead of a backslash, for
readability.
A "test $preserve=f" (missing spaces) was fixed; hashes are no longer
written to "$DOTEST"/rewritten/ unnecessarily.
We used to quote the message for a squash, only to have "echo" unquote it.
Now we use "printf" and do not need to quote to start with.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>