patch 9.1.0720: Wrong breakindentopt=list:-1 with multibyte or TABs

Problem:  Wrong breakindentopt=list:-1 with multibyte chars or TABs in
          text matched by 'formatlistpat' (John M Devin)
Solution: Use the width of the match text (zeertzjq)

fixes: #15634
closes: #15635

Signed-off-by: zeertzjq <zeertzjq@outlook.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/testdir/test_breakindent.vim b/src/testdir/test_breakindent.vim
index b306c02..16a11b3 100644
--- a/src/testdir/test_breakindent.vim
+++ b/src/testdir/test_breakindent.vim
@@ -797,18 +797,73 @@
 	\ ]
   let lines = s:screen_lines2(1, 9, 20)
   call s:compare_lines(expect, lines)
+
+  " check with TABs
+  call setline(1, ["\t1.\tCongress shall make no law",
+        \ "\t2.) Congress shall make no law",
+        \ "\t3.] Congress shall make no law"])
+  setl tabstop=4 list listchars=tab:<->
+  norm! 1gg
+  redraw!
+  let expect = [
+	\ "<-->1.<>Congress    ",
+	\ "        shall make  ",
+	\ "        no law      ",
+	\ "<-->2.) Congress    ",
+	\ "        shall make  ",
+	\ "        no law      ",
+	\ "<-->3.] Congress    ",
+	\ "        shall make  ",
+	\ "        no law      ",
+	\ ]
+  let lines = s:screen_lines2(1, 9, 20)
+  call s:compare_lines(expect, lines)
+
+  setl tabstop=2 nolist
+  redraw!
+  let expect = [
+	\ "  1.  Congress      ",
+	\ "      shall make no ",
+	\ "      law           ",
+	\ "  2.) Congress      ",
+	\ "      shall make no ",
+	\ "      law           ",
+	\ "  3.] Congress      ",
+	\ "      shall make no ",
+	\ "      law           ",
+	\ ]
+  let lines = s:screen_lines2(1, 9, 20)
+  call s:compare_lines(expect, lines)
+
+  setl tabstop& list listchars=space:_
+  redraw!
+  let expect = [
+	\ "^I1.^ICongress_     ",
+	\ "      shall_make_no_",
+	\ "      law           ",
+	\ "^I2.)_Congress_     ",
+	\ "      shall_make_no_",
+	\ "      law           ",
+	\ "^I3.]_Congress_     ",
+	\ "      shall_make_no_",
+	\ "      law           ",
+	\ ]
+  let lines = s:screen_lines2(1, 9, 20)
+  call s:compare_lines(expect, lines)
+
   " check formatlistpat indent with different list levels
-  let &l:flp = '^\s*\*\+\s\+'
+  let &l:flp = '^\s*\(\*\|•\)\+\s\+'
+  setl list&vim listchars&vim
   %delete _
   call setline(1, ['* Congress shall make no law',
-        \ '*** Congress shall make no law',
+        \ '••• Congress shall make no law',
         \ '**** Congress shall make no law'])
   norm! 1gg
   redraw!
   let expect = [
 	\ "* Congress shall    ",
 	\ "  make no law       ",
-	\ "*** Congress shall  ",
+	\ "••• Congress shall  ",
 	\ "    make no law     ",
 	\ "**** Congress shall ",
 	\ "     make no law    ",
@@ -824,7 +879,7 @@
   let expect = [
 	\ "* Congress shall    ",
 	\ "> make no law       ",
-	\ "*** Congress shall  ",
+	\ "••• Congress shall  ",
 	\ ">   make no law     ",
 	\ "**** Congress shall ",
 	\ ">    make no law    ",
@@ -840,7 +895,7 @@
   let expect = [
 	\ "* Congress shall    ",
 	\ ">   make no law     ",
-	\ "*** Congress shall  ",
+	\ "••• Congress shall  ",
 	\ ">     make no law   ",
 	\ "**** Congress shall ",
 	\ ">      make no law  ",