seq: fix misaligment with -w when no precision for start value

* src/seq.c (get_default_format): Also account for the case where '.'
is auto added to the start value, which is significant when the
number sequence narrows.
* tests/misc/seq.pl: Add two new tests for the failing cases.
* NEWS: Mention the fix.
Fixes http://bugs.gnu.org/13394

1 files changed, 2 insertions, 0 deletions

diff --git a/src/seq.c b/src/seq.c
index 22e5ec5da..5ad5fad94 100644
--- a/src/seq.c
+++ b/src/seq.c
@@ -336,6 +336,8 @@ get_default_format (operand first, operand step, operand last)
             last_width--;  /* don't include space for '.' */
           if (last.precision == 0 && prec)
             last_width++;  /* include space for '.' */
+          if (first.precision == 0 && prec)
+            first_width++;  /* include space for '.' */
           size_t width = MAX (first_width, last_width);
           if (width <= INT_MAX)
             {