Merge branch 'mv/log-since-as-filter'

"git log --since=X" will stop traversal upon seeing a commit that
is older than X, but there may be commits behind it that is younger
than X when the commit was created with a faulty clock.  A new
option is added to keep digging without stopping, and instead
filter out commits with timestamp older than X.

* mv/log-since-as-filter:
  log: "--since-as-filter" option is a non-terminating "--since" variant

t/t4217-log-limit.sh

@@ -0,0 +1,41 @@
+#!/bin/sh
+
+test_description='git log with filter options limiting the output'
+
+. ./test-lib.sh
+
+test_expect_success 'setup test' '
+	git init &&
+	echo a >file &&
+	git add file &&
+	GIT_COMMITTER_DATE="2021-02-01 00:00" git commit -m init &&
+	echo a >>file &&
+	git add file &&
+	GIT_COMMITTER_DATE="2022-02-01 00:00" git commit -m first &&
+	echo a >>file &&
+	git add file &&
+	GIT_COMMITTER_DATE="2021-03-01 00:00" git commit -m second &&
+	echo a >>file &&
+	git add file &&
+	GIT_COMMITTER_DATE="2022-03-01 00:00" git commit -m third
+'
+
+test_expect_success 'git log --since-as-filter=...' '
+	git log --since-as-filter="2022-01-01" --format=%s >actual &&
+	cat >expect <<-\EOF &&
+	third
+	first
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success 'git log --children --since-as-filter=...' '
+	git log --children --since-as-filter="2022-01-01" --format=%s >actual &&
+	cat >expect <<-\EOF &&
+	third
+	first
+	EOF
+	test_cmp expect actual
+'
+
+test_done