vim-patch:7.4.2201

Problem:    The sign column disappears when the last sign is deleted.
Solution:   Add the 'signcolumn' option. (Christian Brabandt)

95ec9d6a6a

src/nvim/edit.c

@@ -5708,7 +5708,7 @@ comp_textwidth (
       textwidth -= 1;
     textwidth -= curwin->w_p_fdc;
 
-    if (curwin->w_buffer->b_signlist != NULL) {
+    if (signcolumn_on(curwin)) {
         textwidth -= 1;
     }