vim-patch:8.1.1564: sign column takes up space

Problem:    Sign column takes up space.  (Adam Stankiewicz)
Solution:   Optionally put signs in the number column. (Yegappan Lakshmanan,
            closes vim/vim#4555, closes vim/vim#4515)
vim/vim@394c5d8

src/nvim/option.c

@@ -7404,6 +7404,7 @@ int win_signcol_count(win_T *wp)
   int maximum = 1, needed_signcols;
   const char *scl = (const char *)wp->w_p_scl;
 
+  // Note: It checks "no" or "number" in 'signcolumn' option
   if (*scl == 'n'
       && (*(scl + 1) == 'o' || (*(scl + 1) == 'u'
                                 && (wp->w_p_nu || wp->w_p_rnu)))) {

src/nvim/screen.c

@@ -4477,7 +4477,7 @@ void screen_adjust_grid(ScreenGrid **grid, int *row_off, int *col_off)
 // If 'nrcol' is TRUE, the sign is going to be displayed in the number column.
 // Otherwise the sign is going to be displayed in the sign column.
 static void get_sign_display_info(
-    int nrcol,
+    bool nrcol,
     win_T *wp,
     linenr_T lnum,
     int row,

src/nvim/testdir/test_signs.vim

@@ -6,6 +6,7 @@ endif
 
 source screendump.vim
 
+" Note: In neovim, swapfile feature must be disabled
 set noswapfile
 
 func Test_sign()