bug#58703: 29.0.50; [noverlay] overlays-at misses overlays starting at POS

[Matt Armstrong]

X-Debbugs-CC: Stefan Monnier <monnier@iro.umontreal.ca>

This bug pertains to the feature/noverlay branch.

The following test passes on master but fails on noverlay:

(ert-deftest test-overlays-at-narrow-to-region-end ()
  (with-temp-buffer
   (insert (make-string 30 ?x))
   (make-overlay 10 11)
   (narrow-to-region 10 10)
   (should (equal
            '((10 11))
            (sorted-overlays-at 10)))))

I've got a patch to fix and will post it once I get a bug number.