diff --git a/src/testdir/test15.in b/src/testdir/test15.in
new file mode 100644
index 0000000..366529a
--- /dev/null
+++ b/src/testdir/test15.in
@@ -0,0 +1,136 @@
+Tests for :right on text with embedded TAB.
+Also test formatting a paragraph.
+Also test undo after ":%s" and formatting.
+
+STARTTEST
+:so small.vim
+:set tw=65
+
+:/^\s*test for :left/,/^\s*test for :center/ left
+:/^\s*test for :center/,/^\s*test for :right/ center
+:/^\s*test for :right/,/^xxx/-1 right
+:set fo+=tcroql tw=72
+/xxxxxxxx$
+0gq6kk
+:set nocp viminfo+=nviminfo
+:" undo/redo here to make the next undo only work on the following changes
+u
+:map gg :.,.+2s/^/x/<CR>kk:set tw=3<CR>gqq
+/^aa
+ggu
+:?test for :left?,$w! test.out
+:qa!
+ENDTEST
+
+	test for :left
+	  a		a
+	    fa		a
+	  dfa		a
+	        sdfa		a
+	  asdfa		a
+	        xasdfa		a
+asxxdfa		a
+
+	test for :center
+	  a		a
+	    fa		afd asdf
+	  dfa		a
+	        sdfa		afd asdf
+	  asdfa		a
+	        xasdfa		asdfasdfasdfasdfasdf
+asxxdfa		a
+
+	test for :right
+	a		a
+	fa		a
+	dfa		a
+	sdfa		a
+	asdfa		a
+	xasdfa		a
+	asxxdfa		a
+	asxa;ofa		a
+	asdfaqwer		a
+	a		ax
+	fa		ax
+	dfa		ax
+	sdfa		ax
+	asdfa		ax
+	xasdfa		ax
+	asxxdfa		ax
+	asxa;ofa		ax
+	asdfaqwer		ax
+	a		axx
+	fa		axx
+	dfa		axx
+	sdfa		axx
+	asdfa		axx
+	xasdfa		axx
+	asxxdfa		axx
+	asxa;ofa		axx
+	asdfaqwer		axx
+	a		axxx
+	fa		axxx
+	dfa		axxx
+	sdfa		axxx
+	asdfa		axxx
+	xasdfa		axxx
+	asxxdfa		axxx
+	asxa;ofa		axxx
+	asdfaqwer		axxx
+	a		axxxo
+	fa		axxxo
+	dfa		axxxo
+	sdfa		axxxo
+	asdfa		axxxo
+	xasdfa		axxxo
+	asxxdfa		axxxo
+	asxa;ofa		axxxo
+	asdfaqwer		axxxo
+	a		axxxoi
+	fa		axxxoi
+	dfa		axxxoi
+	sdfa		axxxoi
+	asdfa		axxxoi
+	xasdfa		axxxoi
+	asxxdfa		axxxoi
+	asxa;ofa		axxxoi
+	asdfaqwer		axxxoi
+	a		axxxoik
+	fa		axxxoik
+	dfa		axxxoik
+	sdfa		axxxoik
+	asdfa		axxxoik
+	xasdfa		axxxoik
+	asxxdfa		axxxoik
+	asxa;ofa		axxxoik
+	asdfaqwer		axxxoik
+	a		axxxoike
+	fa		axxxoike
+	dfa		axxxoike
+	sdfa		axxxoike
+	asdfa		axxxoike
+	xasdfa		axxxoike
+	asxxdfa		axxxoike
+	asxa;ofa		axxxoike
+	asdfaqwer		axxxoike
+	a		axxxoikey
+	fa		axxxoikey
+	dfa		axxxoikey
+	sdfa		axxxoikey
+	asdfa		axxxoikey
+	xasdfa		axxxoikey
+	asxxdfa		axxxoikey
+	asxa;ofa		axxxoikey
+	asdfaqwer		axxxoikey
+
+xxxxx xx xxxxxx 
+xxxxxxx xxxxxxxxx xxx xxxx xxxxx xxxxx xxx xx
+xxxxxxxxxxxxxxxxxx xxxxx xxxx, xxxx xxxx xxxx xxxx xxx xx xx
+xx xxxxxxx. xxxx xxxx.
+
+> xx xx, xxxx xxxx xxx xxxx xxx xxxxx xxx xxx xxxxxxx xxx xxxxx
+> xxxxxx xxxxxxx: xxxx xxxxxxx, xx xxxxxx xxxx xxxxxxxxxx
+
+aa aa aa aa
+bb bb bb bb
+cc cc cc cc