Improve display of columns on mode-line

* src/xdisp.c (decode_mode_spec): A better representation for
"unknown column number".

1 files changed, 12 insertions, 2 deletions

diff --git a/src/xdisp.c b/src/xdisp.c
index c73958854cd..add14a084fc 100644
--- a/src/xdisp.c
+++ b/src/xdisp.c
@@ -27620,10 +27620,20 @@ decode_mode_spec (struct window *w, register int c, int field_width,
          even crash emacs.)  */
       if (mode_line_target == MODE_LINE_TITLE)
         return "";
+      else if (b->long_line_optimizations_p)
+        {
+          char *p = decode_mode_spec_buf;
+          int pad = width - 2;
+          while (pad-- > 0)
+            *p++ = ' ';
+          *p++ = '?';
+          *p++ = '?';
+          *p = '\0';
+          return decode_mode_spec_buf;
+        }
       else
         {
-          ptrdiff_t col =
-            b->long_line_optimizations_p ? 0 : current_column ();
+          ptrdiff_t col = current_column ();
           int disp_col = (c == 'C') ? col + 1 : col;
           w->column_number_displayed = col;
           pint2str (decode_mode_spec_buf, width, disp_col);