patch 9.1.0103: 'breakindentopt' "min" not correct with 'signcolumn'

Problem:  'breakindentopt' "min" works incorrectly with 'signcolumn'.
Solution: Use win_col_off() and win_col_off2().
          (zeertzjq)

closes: #14014

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 9fde0f3..96d91c9 100644
--- a/src/testdir/test_breakindent.vim
+++ b/src/testdir/test_breakindent.vim
@@ -733,7 +733,7 @@
 	\ "shall make no law   ",
 	\ ]
   call s:compare_lines(expect, lines)
-  " set minimum indent
+  " set minimum text width
   setl briopt=min:5
   redraw!
   let lines = s:screen_lines2(1, 6, 20)
@@ -1133,4 +1133,36 @@
   bwipe!
 endfunc
 
+func Test_breakindent_min_with_signcol()
+  call s:test_windows('setl briopt=min:15 signcolumn=yes')
+  redraw!
+  let expect = [
+        \ "      abcdefghijklmn",
+        \ "     opqrstuvwxyzABC",
+        \ "     DEFGHIJKLMNOP  "
+        \ ]
+  let lines = s:screen_lines(line('.'), 20)
+  call s:compare_lines(expect, lines)
+  setl briopt=min:17
+  redraw!
+  let expect = [
+        \ "      abcdefghijklmn",
+        \ "   opqrstuvwxyzABCDE",
+        \ "   FGHIJKLMNOP      "
+        \ ]
+  let lines = s:screen_lines(line('.'), 20)
+  call s:compare_lines(expect, lines)
+  setl briopt=min:19
+  redraw!
+  let expect = [
+        \ "      abcdefghijklmn",
+        \ "  opqrstuvwxyzABCDEF",
+        \ "  GHIJKLMNOP        "
+        \ ]
+  let lines = s:screen_lines(line('.'), 20)
+  call s:compare_lines(expect, lines)
+
+  call s:close_windows()
+endfunc
+
 " vim: shiftwidth=2 sts=2 expandtab
diff --git a/src/testdir/test_diffmode.vim b/src/testdir/test_diffmode.vim
index 8e7d5ce..bae94f6 100644
--- a/src/testdir/test_diffmode.vim
+++ b/src/testdir/test_diffmode.vim
Binary files differ