Add support for back tab (CSI CBT), and forward tab (CSI CHT) too.

Resolves #539.

src/tests/Makefile.am

@@ -33,8 +33,7 @@ check_PROGRAMS = ocb-aes encrypt-decrypt base64
 TESTS = ocb-aes encrypt-decrypt base64 $(displaytests)
 XFAIL_TESTS = \
 	e2e-failure.test \
-	emulation-attributes-256color8.test \
-	emulation-back-tab.test
+	emulation-attributes-256color8.test
 
 base64_vector.cc: $(srcdir)/genbase64.pl
 	$(AM_V_GEN)echo '#include "base64_vector.h"' > base64_vector.cc || rm base64_vector.cc

src/tests/emulation-back-tab.test

@@ -27,17 +27,29 @@ fi
 baseline()
 {
     printf 'hello, wurld\033[Zo\n'
+    printf 'hello, wurld\033[2Zo\n'
+    printf 'hello, wurld\033[99Z9\n'
+    printf 'hello, wurld\033[It\n'
+    printf '\033[99I#\n'
 }
 
 post()
 {
-    if grep -q 'hello, world' $(basename $0).d/baseline.capture; then
-	exit 0
-    fi
+    # Basic previously-failing case.
     if grep -q 'hello, wurldo' $(basename $0).d/baseline.capture; then
 	exit 1
     fi
-    exit 99
+    if ! grep -q 'hello, world' $(basename $0).d/baseline.capture; then
+	exit 99
+    fi
+    # New test cases for new code.
+    if ! grep -q 'oello, wurld' $(basename $0).d/baseline.capture ||
+	    ! grep -q '9ello, wurld' $(basename $0).d/baseline.capture ||
+	    ! grep -q 'hello, wurld    t' $(basename $0).d/baseline.capture ||
+	    ! grep -E -q '^ {79}#$' $(basename $0).d/baseline.capture; then
+	exit 1
+    fi
+    exit 0
 }
 
 case $1 in