bug#27281: Fix nlinum missing line numbers.

[William Gilbert <gilbertw1@gmail.com>]

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I've been working to track to down a bug where line numbers are
occasionally missing when using nlinum mode. Currently there is a package
written to workaround the problem that has a picture and description of the
problem: https://github.com/hlissner/emacs-nlinum-hl.

After extensive debugging I've tracked the problem down to the
'nlinum--region' function. Specifically the while loop check that
determines if '(point)' is less than the limit. I've found that the problem
exists when '(point)' is exactly equal to 'limit'. In this scenario the
loop terminates and the last line in the region is not provided with a line
number. I was able to remedy the problem by changing the condition from
'less than' to 'less than or equal to', which will allow the last line in
the region to be properly assigned a line number.

Thank you.

Diff:

diff --git a/packages/nlinum/nlinum.el b/packages/nlinum/nlinum.el
index ca4f949fc..f82b61987 100644
--- a/packages/nlinum/nlinum.el
+++ b/packages/nlinum/nlinum.el
@@ -303,7 +303,7 @@ it may cause the margin to be resized and line numbers
to be recomputed.")
       (remove-overlays (point) limit 'nlinum t)
       (let ((line (nlinum--line-number-at-pos)))
         (while
-            (and (not (eobp)) (< (point) limit)
+            (and (not (eobp)) (<= (point) limit)
                  (let* ((ol (make-overlay (point) (1+ (point))))
                         (str (funcall nlinum-format-function
                                       line nlinum--width))

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