Merge branch 'ab/range-diff-no-patch'

The "--no-patch" option, which can be used to get a high-level
overview without the actual line-by-line patch difference shown, of
the "range-diff" command was earlier broken, which has been
corrected.

* ab/range-diff-no-patch:
  range-diff: make diff option behavior (e.g. --stat) consistent
  range-diff: fix regression in passing along diff options
  range-diff doc: add a section about output stability

diff --cc range-diff.c
Simple merge

diff --cc t/t3206-range-diff.sh
index 6aae36417122a8af5d010910fb2586aa9ec91815,097ce34f849e594d8bb25e89047837f5157e8174..e497c1358f8b2da6960d3d73db3cc75f9f7df85c
--- 1/t/t3206-range-diff.sh
--- 2/t/t3206-range-diff.sh
+++ b/t/t3206-range-diff.sh
@@@ -122,40 -122,36 +122,70 @@@ test_expect_success 'changed commit' 
        test_cmp expected actual
  '
  
+ test_expect_success 'changed commit with --no-patch diff option' '
+       git range-diff --no-color --no-patch topic...changed >actual &&
+       cat >expected <<-EOF &&
+       1:  4de457d = 1:  a4b3333 s/5/A/
+       2:  fccce22 = 2:  f51d370 s/4/A/
+       3:  147e64e ! 3:  0559556 s/11/B/
+       4:  a63e992 ! 4:  d966c5c s/12/B/
+       EOF
+       test_cmp expected actual
+ '
+ 
+ test_expect_success 'changed commit with --stat diff option' '
+       git range-diff --no-color --stat topic...changed >actual &&
+       cat >expected <<-EOF &&
+       1:  4de457d = 1:  a4b3333 s/5/A/
+            a => b | 0
+            1 file changed, 0 insertions(+), 0 deletions(-)
+       2:  fccce22 = 2:  f51d370 s/4/A/
+            a => b | 0
+            1 file changed, 0 insertions(+), 0 deletions(-)
+       3:  147e64e ! 3:  0559556 s/11/B/
+            a => b | 0
+            1 file changed, 0 insertions(+), 0 deletions(-)
+       4:  a63e992 ! 4:  d966c5c s/12/B/
+            a => b | 0
+            1 file changed, 0 insertions(+), 0 deletions(-)
+       EOF
+       test_cmp expected actual
+ '
+ 
 +test_expect_success 'changed commit with sm config' '
 +      git range-diff --no-color --submodule=log topic...changed >actual &&
 +      cat >expected <<-EOF &&
 +      1:  4de457d = 1:  a4b3333 s/5/A/
 +      2:  fccce22 = 2:  f51d370 s/4/A/
 +      3:  147e64e ! 3:  0559556 s/11/B/
 +          @@ -10,7 +10,7 @@
 +            9
 +            10
 +           -11
 +          -+B
 +          ++BB
 +            12
 +            13
 +            14
 +      4:  a63e992 ! 4:  d966c5c s/12/B/
 +          @@ -8,7 +8,7 @@
 +           @@
 +            9
 +            10
 +          - B
 +          + BB
 +           -12
 +           +B
 +            13
 +      EOF
 +      test_cmp expected actual
 +'
 +
 +test_expect_success 'no commits on one side' '
 +      git commit --amend -m "new message" &&
 +      git range-diff master HEAD@{1} HEAD
 +'
 +
  test_expect_success 'changed message' '
        git range-diff --no-color topic...changed-message >actual &&
        sed s/Z/\ /g >expected <<-EOF &&