[PATCH v2] search: skip a match on the magic line, as it is a just convenience line

As the magic line isn't really a line (it is not counted in the number
of lines read and written), and nothing is on it (not even a newline),
it doesn't make sense to allow any regex, like ^ or $, to match it.

This fixes https://savannah.gnu.org/bugs/?63034.
Indirectly-reported-by: Mike Scalora <[email protected]>

Bug existed since before version 2.0.0.
---
 src/search.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/search.c b/src/search.c
index d759668b..57236667 100644
--- a/src/search.c
+++ b/src/search.c
@@ -222,8 +222,9 @@ int findnextstr(const char *needle, bool whole_word_only, int modus,
 				continue;
 			}
 #endif
-			/* The match is valid. */
-			break;
+			/* When not on the magic line, the match is valid. */
+			if (line->next || line->data[0])
+				break;
 		}
 
 #ifndef NANO_TINY
-- 
2.37.2