[test] Add test for cursive-positioning with mixed directions

Fails now.  Fix coming.  See thread "Issue with cursive attachment"
started by Khaled.  Test fonts were made by modifying test font
from Khaled to add more anchors.

test/shaping/Makefile.am

@@ -40,6 +40,7 @@ TESTS = \
 	tests/arabic-feature-order.tests \
 	tests/cluster.tests \
 	tests/context-matching.tests \
+	tests/cursive-positioning.tests \
 	tests/default-ignorables.tests \
 	tests/hangul-jamo.tests \
 	tests/indic-joiner-candrabindu.tests \

test/shaping/fonts/sha1sum/MANIFEST

@@ -2,6 +2,7 @@
 191826b9643e3f124d865d617ae609db6a2ce203.ttf
 226bc2deab3846f1a682085f70c67d0421014144.ttf
 270b89df543a7e48e206a2d830c0e10e5265c630.ttf
+298c9e1d955f10f6f72c6915c3c6ff9bf9695cec.ttf
 37033cc5cf37bb223d7355153016b6ccece93b28.ttf
 4cce528e99f600ed9c25a2b69e32eb94a03b4ae8.ttf
 5028afb650b1bb718ed2131e872fbcce57828fff.ttf
@@ -15,6 +16,7 @@
 a919b33197965846f21074b24e30250d67277bce.ttf
 bb29ce50df2bdba2d10726427c6b7609bf460e04.ttf
 bb9473d2403488714043bcfb946c9f78b86ad627.ttf
+c4e48b0886ef460f532fb49f00047ec92c432ec0.ttf
 d629e7fedc0b350222d7987345fe61613fa3929a.ttf
 df768b9c257e0c9c35786c47cae15c46571d56be.ttf
 e207635780b42f898d58654b65098763e340f5c7.ttf

test/shaping/tests/MANIFEST

@@ -2,6 +2,7 @@ arabic-fallback-shaping.tests
 arabic-feature-order.tests
 cluster.tests
 context-matching.tests
+cursive-positioning.tests
 default-ignorables.tests
 hangul-jamo.tests
 indic-joiner-candrabindu.tests

test/shaping/tests/cursive-positioning.tests

+fonts/sha1sum/c4e48b0886ef460f532fb49f00047ec92c432ec0.ttf::U+0643,U+0645,U+0645,U+062B,U+0644:[gid8=4+738|gid5=3@441,1197+0|gid6=3@0,432+405|gid9=2@0,477+452|gid9=1@0,977+452|gid10=0@20,1577+207]
+fonts/sha1sum/298c9e1d955f10f6f72c6915c3c6ff9bf9695cec.ttf::U+0643,U+0645,U+0645,U+062B,U+0644:[gid8=4+738|gid5=3@441,1197+0|gid6=3@0,432+405|gid9=2@0,477+500|gid9=1@0,577+452|gid10=0@20,1177+207]