patch 8.2.3198: cannot use 'formatlistpat' for breakindent

Problem:    Cannot use 'formatlistpat' for breakindent.
Solution:   Use a negative list indent. (Maxim Kim, closes #8594)

Author: habamax

runtime/doc/options.txt

@@ -1326,9 +1326,11 @@ A jump table for the options with a short description can be found at |Q_op|.
 			    continuation (positive).
 		sbr	    Display the 'showbreak' value before applying the
 			    additional indent.
-		list:{n}    Adds an additional indent for lines that match a 
+		list:{n}    Adds an additional indent for lines that match a
 			    numbered or bulleted list (using the
 			    'formatlistpat' setting).
+		list:-1	    Uses the length of a match with 'formatlistpat'
+			    for indentation.
 	The default value for min is 20, shift and list is 0.
 
 						*'browsedir'* *'bsdir'*

src/indent.c

@@ -941,15 +941,11 @@ get_breakindent_win(
     }
     bri = prev_indent + wp->w_briopt_shift;
 
-    // indent minus the length of the showbreak string
-    if (wp->w_briopt_sbr)
-	bri -= vim_strsize(get_showbreak_value(wp));
-
     // Add offset for number column, if 'n' is in 'cpoptions'
     bri += win_col_off2(wp);
 
     // add additional indent for numbered lists
-    if (wp->w_briopt_list > 0)
+    if (wp->w_briopt_list != 0)
     {
 	regmatch_T	    regmatch;
 
@@ -958,11 +954,21 @@ get_breakindent_win(
 	if (regmatch.regprog != NULL)
 	{
 	    if (vim_regexec(&regmatch, line, 0))
-		bri += wp->w_briopt_list;
+	    {
+		if (wp->w_briopt_list > 0)
+		    bri += wp->w_briopt_list;
+		else
+		    bri = (*regmatch.endp - *regmatch.startp);
+	    }
 	    vim_regfree(regmatch.regprog);
 	}
     }
 
+    // indent minus the length of the showbreak string
+    if (wp->w_briopt_sbr)
+	bri -= vim_strsize(get_showbreak_value(wp));
+
+
     // never indent past left window margin
     if (bri < 0)
 	bri = 0;

src/testdir/test_breakindent.vim

@@ -759,6 +759,7 @@ func Test_breakindent20_list()
 	\ ]
   let lines = s:screen_lines2(1, 9, 20)
   call s:compare_lines(expect, lines)
+
   " reset linebreak option
   " Note: it indents by one additional
   " space, because of the leading space.
@@ -775,7 +776,59 @@ func Test_breakindent20_list()
   let lines = s:screen_lines2(1, 6, 20)
   call s:compare_lines(expect, lines)
 
-  call s:close_windows('set breakindent& briopt& linebreak& list& listchars&')
+  " check formatlistpat indent
+  setl briopt=min:5,list:-1
+  setl linebreak list&vim listchars&vim
+  let &l:flp = '^\s*\d\+\.\?[\]:)}\t ]\s*'
+  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)
+  " check formatlistpat indent with different list levels
+  let &l:flp = '^\s*\*\+\s\+'
+  redraw!
+  %delete _
+  call setline(1, ['* Congress shall make no law',
+        \ '*** Congress shall make no law',
+        \ '**** Congress shall make no law'])
+  norm! 1gg
+  let expect = [
+	\ "* Congress shall    ",
+	\ "  make no law       ",
+	\ "*** Congress shall  ",
+	\ "    make no law     ",
+	\ "**** Congress shall ",
+	\ "     make no law    ",
+	\ ]
+  let lines = s:screen_lines2(1, 6, 20)
+  call s:compare_lines(expect, lines)
+
+  " check formatlistpat indent with different list level
+  " showbreak and sbr
+  setl briopt=min:5,sbr,list:-1,shift:2
+  setl showbreak=>
+  redraw!
+  let expect = [
+	\ "* Congress shall    ",
+	\ "> make no law       ",
+	\ "*** Congress shall  ",
+	\ ">   make no law     ",
+	\ "**** Congress shall ",
+	\ ">    make no law    ",
+	\ ]
+  let lines = s:screen_lines2(1, 6, 20)
+  call s:compare_lines(expect, lines)
+  call s:close_windows('set breakindent& briopt& linebreak& list& listchars& showbreak&')
 endfunc
 
 " vim: shiftwidth=2 sts=2 expandtab

src/version.c

@@ -755,6 +755,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    3198,
 /**/
     3197,
 /**/