Don't hide flymake diagnostics on empty first line (bug#70310)

A diagnostic first in the buffer, typically the lexical cookie warning,
got lost if that line was empty.

* lisp/progmodes/elisp-mode.el (elisp-flymake--byte-compile-done):
Make sure the location interval doesn't go beyond the buffer bounds.

(cherry picked from commit b436f430e3897e1aa6dcb5a39564a3553bbf631f)

diff --git a/lisp/progmodes/elisp-mode.el b/lisp/progmodes/elisp-mode.el
index c99c34c9c0ffce0c1726cf41969d2d6d517a30ea..680dd331fbf6227f711fc8de99f7af4c8260b577 100644 (file)
--- a/lisp/progmodes/elisp-mode.el
+++ b/lisp/progmodes/elisp-mode.el
@@ -2150,8 +2150,13 @@ Calls REPORT-FN directly."
                                  (point-max)))
                   collect (flymake-make-diagnostic
                            (current-buffer)
-                           (if (= beg end) (1- beg) beg)
-                           end
+                           (if (= beg end)
+                               (max (1- beg) (point-min))
+                             beg)
+                           (if (= beg end)
+                               (min (max beg (1+ (point-min)))
+                                    (point-max))
+                             end)
                            level
                            string)))))))