status, branch: fix the misleading "bisecting" message

The current message is "bisecting %s" (or "bisecting branch %s").
"%s" is the current branch when we started bisecting. Clarify that to
avoid confusion with good and bad refs passed to "bisect" command.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/branch.c

@@ -562,7 +562,7 @@ static char *get_head_description(void)
 		strbuf_addf(&desc, _("(no branch, rebasing %s)"),
 			    state.branch);
 	else if (state.bisect_in_progress)
-		strbuf_addf(&desc, _("(no branch, bisecting %s)"),
+		strbuf_addf(&desc, _("(no branch, bisect started on %s)"),
 			    state.branch);
 	else if (state.detached_from)
 		strbuf_addf(&desc, _("(detached from %s)"),

t/t6030-bisect-porcelain.sh

@@ -164,7 +164,7 @@ test_expect_success 'bisect start: existing ".git/BISECT_START" not modified if
 	cp .git/BISECT_START saved &&
 	test_must_fail git bisect start $HASH4 foo -- &&
 	git branch > branch.output &&
-	test_i18ngrep "* (no branch, bisecting other)" branch.output > /dev/null &&
+	test_i18ngrep "* (no branch, bisect started on other)" branch.output > /dev/null &&
 	test_cmp saved .git/BISECT_START
 '
 test_expect_success 'bisect start: no ".git/BISECT_START" if mistaken rev' '

t/t7512-status-help.sh

@@ -578,7 +578,7 @@ test_expect_success 'status when bisecting' '
 	TGT=$(git rev-parse --short two_bisect) &&
 	cat >expected <<-EOF &&
 	# HEAD detached at $TGT
-	# You are currently bisecting branch '\''bisect'\''.
+	# You are currently bisecting, started from branch '\''bisect'\''.
 	#   (use "git bisect reset" to get back to the original branch)
 	#
 	nothing to commit (use -u to show untracked files)

wt-status.c

@@ -953,7 +953,7 @@ static void show_bisect_in_progress(struct wt_status *s,
 {
 	if (state->branch)
 		status_printf_ln(s, color,
-				 _("You are currently bisecting branch '%s'."),
+				 _("You are currently bisecting, started from branch '%s'."),
 				 state->branch);
 	else
 		status_printf_ln(s, color,