log -L: fix overlapping input ranges

The existing code was too defensive, and would trigger the assert in
range_set_append() if the user gave overlapping ranges.

The intent was always to define overlapping ranges as just the union
of all of them, as evidenced by the call to sort_and_merge_range_set().
(Which was already used, unlike what the comment said.)

Fix by splitting out the meat of range_set_append() to a new _unsafe()
function that lacks the paranoia.  sort_and_merge_range_set will fix
up the ranges, so we don't need the checks there.

Signed-off-by: Thomas Rast <trast@inf.ethz.ch>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/t/t4211-line-log.sh b/t/t4211-line-log.sh
index 426a82868e..2341351e1b 100755
--- a/t/t4211-line-log.sh
+++ b/t/t4211-line-log.sh
@@ -39,6 +39,12 @@ canned_test "-L 24,+1:a.c simple" vanishes-early
 
 canned_test "-L '/long f/,/^}/:b.c' move-support" move-support-f
 
+canned_test "-L 4,12:a.c -L :main:a.c simple" multiple
+canned_test "-L 4,18:a.c -L :main:a.c simple" multiple-overlapping
+canned_test "-L :main:a.c -L 4,18:a.c simple" multiple-overlapping
+canned_test "-L 4:a.c -L 8,12:a.c simple" multiple-superset
+canned_test "-L 8,12:a.c -L 4:a.c simple" multiple-superset
+
 test_bad_opts "-L" "switch.*requires a value"
 test_bad_opts "-L b.c" "argument.*not of the form"
 test_bad_opts "-L 1:" "argument.*not of the form"