patch 8.0.0126

Problem:    Display problem with 'foldcolumn' and a wide character.
            (esiegerman)
Solution:   Don't use "extra" but an allocated buffer. (Christian Brabandt,
            closes #1310)

Author: brammool

src/Makefile

@@ -2085,6 +2085,7 @@ test_arglist \
 	test_delete \
 	test_diffmode \
 	test_digraph \
+	test_display \
 	test_ex_undo \
 	test_execute_func \
 	test_expand \

src/screen.c

@@ -3649,13 +3649,19 @@ win_line(
 		draw_state = WL_FOLD;
 		if (fdc > 0)
 		{
-		    /* Draw the 'foldcolumn'. */
-		    fill_foldcolumn(extra, wp, FALSE, lnum);
-		    n_extra = fdc;
-		    p_extra = extra;
-		    p_extra[n_extra] = NUL;
-		    c_extra = NUL;
-		    char_attr = hl_attr(HLF_FC);
+		    /* Draw the 'foldcolumn'.  Allocate a buffer, "extra" may
+		     * already be in used. */
+		    p_extra_free = alloc(12 + 1);
+
+		    if (p_extra_free != NULL)
+		    {
+			fill_foldcolumn(p_extra_free, wp, FALSE, lnum);
+			n_extra = fdc;
+			p_extra_free[n_extra] = NUL;
+			p_extra = p_extra_free;
+			c_extra = NUL;
+			char_attr = hl_attr(HLF_FC);
+		    }
 		}
 	    }
 #endif

src/testdir/Make_all.mak

@@ -148,6 +148,7 @@ NEW_TESTS = test_arglist.res \
 	    test_cscope.res \
 	    test_diffmode.res \
 	    test_digraph.res \
+	    test_display.res \
 	    test_farsi.res \
 	    test_fnameescape.res \
 	    test_gf.res \

src/testdir/test_display.vim

@@ -0,0 +1,37 @@
+" Test for displaying stuff
+if !has('gui_running') && has('unix')
+  set term=ansi
+endif
+
+function! s:screenline(lnum, nr) abort
+  let line = []
+  for j in range(a:nr)
+    for c in range(1, winwidth(0))
+        call add(line, nr2char(screenchar(a:lnum+j, c)))
+    endfor
+    call add(line, "\n")
+  endfor
+  return join(line, '')
+endfunction
+
+function! Test_display_foldcolumn()
+  new
+  vnew
+  vert resize 25
+
+  1put='e more noise blah blah‚ more stuff here'
+
+  let expect = "e more noise blah blah<82\n> more stuff here        \n"
+
+  call cursor(2, 1)
+  norm! zt
+  redraw!
+  call assert_equal(expect, s:screenline(1,2))
+  set fdc=2
+  redraw!
+  let expect = "  e more noise blah blah<\n  82> more stuff here    \n"
+  call assert_equal(expect, s:screenline(1,2))
+
+  quit!
+  quit!
+endfunction

src/version.c

@@ -764,6 +764,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    126,
 /**/
     125,
 /**/