patch 8.1.2245: third character of 'listchars' tab shows in wrong place

Problem:    Third character of 'listchars' tab shows in wrong place when
            'breakindent' is set.
Solution:   Set c_final to NUL. (Naruhiko Nishino, closes #5165)

src/drawline.c

@@ -1173,6 +1173,7 @@ win_line(
 # endif
 		    p_extra = NULL;
 		    c_extra = ' ';
+		    c_final = NUL;
 		    n_extra = get_breakindent_win(wp,
 				       ml_get_buf(wp->w_buffer, lnum, FALSE));
 		    // Correct end of highlighted area for 'breakindent',
@@ -1647,9 +1648,8 @@ win_line(
 #ifdef FEAT_LINEBREAK
 	    int c0;
 #endif
+	    VIM_CLEAR(p_extra_free);
 
-	    if (p_extra_free != NULL)
-		VIM_CLEAR(p_extra_free);
 	    // Get a character from the line itself.
 	    c = *ptr;
 #ifdef FEAT_LINEBREAK

src/testdir/test_breakindent.vim

@@ -614,3 +614,44 @@ func Test_breakindent16_vartabs()
   call s:compare_lines(expect, lines)
   call s:close_windows('set vts&')
 endfunc
+
+func Test_breakindent17_vartabs()
+  if !has("vartabs")
+    return
+  endif
+  let s:input = ""
+  call s:test_windows('setl breakindent list listchars=tab:<-> showbreak=+++')
+  call setline(1, "\t" . repeat('a', 63))
+  vert resize 30
+  norm! 1gg$
+  redraw!
+  let lines = s:screen_lines(1, 30)
+  let expect = [
+	\ "<-->aaaaaaaaaaaaaaaaaaaaaaaaaa",
+	\ "    +++aaaaaaaaaaaaaaaaaaaaaaa",
+	\ "    +++aaaaaaaaaaaaaa         ",
+	\ ]
+  call s:compare_lines(expect, lines)
+  call s:close_windows('set breakindent& list& listchars& showbreak&')
+endfunc
+
+func Test_breakindent18_vartabs()
+  if !has("vartabs")
+    return
+  endif
+  let s:input = ""
+  call s:test_windows('setl breakindent list listchars=tab:<->')
+  call setline(1, "\t" . repeat('a', 63))
+  vert resize 30
+  norm! 1gg$
+  redraw!
+  let lines = s:screen_lines(1, 30)
+  let expect = [
+	\ "<-->aaaaaaaaaaaaaaaaaaaaaaaaaa",
+	\ "    aaaaaaaaaaaaaaaaaaaaaaaaaa",
+	\ "    aaaaaaaaaaa               ",
+	\ ]
+  call s:compare_lines(expect, lines)
+  call s:close_windows('set breakindent& list& listchars&')
+endfunc
+

src/version.c

@@ -741,6 +741,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2245,
 /**/
     2244,
 /**/