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Test the patch merging functionality of `quilt diff'.
$ mkdir patches
$ cat > abc.txt
< a
< b
< c
$ cat > patches/series
< a.diff
< b.diff
< c.diff
$ cat > patches/a.diff
< --- merge.orig/abc.txt
< +++ merge/abc.txt
< @@ -1 +1 @@
< -a
< +a+
$ cat > patches/b.diff
< --- merge.orig/abc.txt
< +++ merge/abc.txt
< @@ -2 +2 @@
< -b
< +b+
$ cat > patches/c.diff
< --- merge.orig/abc.txt
< +++ merge/abc.txt
< @@ -3 +3 @@
< -c
< +c+
$ quilt push -qa
> Applying patch %{P}a.diff
> Applying patch %{P}b.diff
> Applying patch %{P}c.diff
> Now at patch %{P}c.diff
$ quilt diff -P b.diff | grep -v "^\\(---\\|+++\\)"
> Warning: more recent patches modify files in patch %{P}b.diff
>~ Index: [^/]+/abc\.txt
> ===================================================================
> @@ -1,3 +1,3 @@
> a+
> -b
> +b+
> c
$ quilt diff --combine a.diff -P b.diff | grep -v "^\\(---\\|+++\\)"
> Warning: more recent patches modify files in patch %{P}b.diff
>~ Index: [^/]+/abc\.txt
> ===================================================================
> @@ -1,3 +1,3 @@
> -a
> -b
> +a+
> +b+
> c
$ quilt diff --combine b.diff | grep -v "^\\(---\\|+++\\)"
>~ Index: [^/]+/abc\.txt
> ===================================================================
> @@ -1,3 +1,3 @@
> a+
> -b
> -c
> +b+
> +c+
$ quilt diff --combine - | grep -v "^\\(---\\|+++\\)"
>~ Index: [^/]+/abc\.txt
> ===================================================================
> @@ -1,3 +1,3 @@
> -a
> -b
> -c
> +a+
> +b+
> +c+
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