Merge branch 'pw/rebase-keep-empty-fixes'

"git rebase --keep-empty" still removed an empty commit if the
other side contained an empty commit (due to the "does an
equivalent patch exist already?" check), which has been corrected.

* pw/rebase-keep-empty-fixes:
  rebase: respect --no-keep-empty
  rebase -i --keep-empty: don't prune empty commits
  rebase --root: stop assuming squash_onto is unset

Author: gitster

git-rebase.sh

@@ -62,6 +62,7 @@ $(gettext 'Resolve all conflicts manually, mark them as resolved with
 You can instead skip this commit: run "git rebase --skip".
 To abort and get back to the state before "git rebase", run "git rebase --abort".')
 "
+squash_onto=
 unset onto
 unset restrict_revision
 cmd=
@@ -270,6 +271,9 @@ do
 	--allow-empty-message)
 		allow_empty_message=--allow-empty-message
 		;;
+	--no-keep-empty)
+		keep_empty=
+		;;
 	--preserve-merges)
 		preserve_merges=t
 		test -z "$interactive_rebase" && interactive_rebase=implied

sequencer.c

@@ -3001,7 +3001,7 @@ int sequencer_make_script(FILE *out, int argc, const char **argv,
 	init_revisions(&revs, NULL);
 	revs.verbose_header = 1;
 	revs.max_parents = 1;
-	revs.cherry_pick = 1;
+	revs.cherry_mark = 1;
 	revs.limited = 1;
 	revs.reverse = 1;
 	revs.right_only = 1;
@@ -3026,8 +3026,12 @@ int sequencer_make_script(FILE *out, int argc, const char **argv,
 		return error(_("make_script: error preparing revisions"));
 
 	while ((commit = get_revision(&revs))) {
+		int is_empty  = is_original_commit_empty(commit);
+
+		if (!is_empty && (commit->object.flags & PATCHSAME))
+			continue;
 		strbuf_reset(&buf);
-		if (!keep_empty && is_original_commit_empty(commit))
+		if (!keep_empty && is_empty)
 			strbuf_addf(&buf, "%c ", comment_line_char);
 		strbuf_addf(&buf, "%s %s ", insn,
 			    oid_to_hex(&commit->object.oid));

t/t3421-rebase-topology-linear.sh

@@ -215,7 +215,7 @@ test_run_rebase () {
 }
 test_run_rebase success ''
 test_run_rebase failure -m
-test_run_rebase failure -i
+test_run_rebase success -i
 test_run_rebase failure -p
 
 #       m