Revert "reset: Make reset remove the sequencer state"

This reverts commit 95eb88d8ee588d89b4f06d2753ed4d16ab13b39f, which
was a UI experiment that did not reflect how "git reset" actually gets
used.  The reversion also fixes a test, indicated in the patch.

Encouraged-by: Johannes Sixt <j6t@kdbg.org>
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

branch.c

@@ -3,7 +3,6 @@
 #include "refs.h"
 #include "remote.h"
 #include "commit.h"
-#include "sequencer.h"
 
 struct tracking {
 	struct refspec spec;
@@ -247,5 +246,4 @@ void remove_branch_state(void)
 	unlink(git_path("MERGE_MSG"));
 	unlink(git_path("MERGE_MODE"));
 	unlink(git_path("SQUASH_MSG"));
-	remove_sequencer_state(0);
 }

t/t3510-cherry-pick-sequence.sh

@@ -353,7 +353,7 @@ test_expect_success '--continue asks for help after resolving patch to nil' '
 	test_i18ngrep "The previous cherry-pick is now empty" msg
 '
 
-test_expect_failure 'follow advice and skip nil patch' '
+test_expect_success 'follow advice and skip nil patch' '
 	pristine_detach conflicting &&
 	test_must_fail git cherry-pick initial..picked &&
 

t/t7106-reset-sequence.sh

@@ -1,52 +0,0 @@
-#!/bin/sh
-
-test_description='Test interaction of reset --hard with sequencer
-
-  + anotherpick: rewrites foo to d
-  + picked: rewrites foo to c
-  + unrelatedpick: rewrites unrelated to reallyunrelated
-  + base: rewrites foo to b
-  + initial: writes foo as a, unrelated as unrelated
-'
-
-. ./test-lib.sh
-
-pristine_detach () {
-	git cherry-pick --quit &&
-	git checkout -f "$1^0" &&
-	git read-tree -u --reset HEAD &&
-	git clean -d -f -f -q -x
-}
-
-test_expect_success setup '
-	echo unrelated >unrelated &&
-	git add unrelated &&
-	test_commit initial foo a &&
-	test_commit base foo b &&
-	test_commit unrelatedpick unrelated reallyunrelated &&
-	test_commit picked foo c &&
-	test_commit anotherpick foo d &&
-	git config advice.detachedhead false
-
-'
-
-test_expect_success 'reset --hard cleans up sequencer state, providing one-level undo' '
-	pristine_detach initial &&
-	test_must_fail git cherry-pick base..anotherpick &&
-	test_path_is_dir .git/sequencer &&
-	git reset --hard &&
-	test_path_is_missing .git/sequencer &&
-	test_path_is_dir .git/sequencer-old &&
-	git reset --hard &&
-	test_path_is_missing .git/sequencer-old
-'
-
-test_expect_success 'cherry-pick --abort does not leave sequencer-old dir' '
-	pristine_detach initial &&
-	test_must_fail git cherry-pick base..anotherpick &&
-	git cherry-pick --abort &&
-	test_path_is_missing .git/sequencer &&
-	test_path_is_missing .git/sequencer-old
-'
-
-test_done